add lint for inline asm labels that look like binary

compiler/rustc_lint/messages.ftl

@@ -52,10 +52,6 @@ lint_builtin_allow_internal_unsafe =
 lint_builtin_anonymous_params = anonymous parameters are deprecated and will be removed in the next edition
     .suggestion = try naming the parameter or explicitly ignoring it
 
-lint_builtin_asm_labels = avoid using named labels in inline assembly
-    .help = only local labels of the form `<number>:` should be used in inline asm
-    .note = see the asm section of Rust By Example <https://doc.rust-lang.org/nightly/rust-by-example/unsafe/asm.html#labels> for more information
-
 lint_builtin_clashing_extern_diff_name = `{$this}` redeclares `{$orig}` with a different signature
     .previous_decl_label = `{$orig}` previously declared here
     .mismatch_label = this signature doesn't match the previous declaration
@@ -399,6 +395,19 @@ lint_incomplete_include =
 
 lint_inner_macro_attribute_unstable = inner macro attributes are unstable
 
+lint_invalid_asm_label_binary = avoid using labels containing only the digits `0` and `1` in inline assembly
+    .label = use a different label that doesn't start with `0` or `1`
+    .note = an LLVM bug makes these labels ambiguous with a binary literal number
+    .note = see <https://bugs.llvm.org/show_bug.cgi?id=36144> for more information
+
+lint_invalid_asm_label_format_arg = avoid using named labels in inline assembly
+    .help = only local labels of the form `<number>:` should be used in inline asm
+    .note1 = format arguments may expand to a non-numeric value
+    .note2 = see the asm section of Rust By Example <https://doc.rust-lang.org/nightly/rust-by-example/unsafe/asm.html#labels> for more information
+lint_invalid_asm_label_named = avoid using named labels in inline assembly
+    .help = only local labels of the form `<number>:` should be used in inline asm
+    .note = see the asm section of Rust By Example <https://doc.rust-lang.org/nightly/rust-by-example/unsafe/asm.html#labels> for more information
+lint_invalid_asm_label_no_span = the label may be declared in the expansion of a macro
 lint_invalid_crate_type_value = invalid `crate_type` value
     .suggestion = did you mean
 

compiler/rustc_lint/src/builtin.rs

@@ -30,13 +30,13 @@ use crate::{
         BuiltinExplicitOutlivesSuggestion, BuiltinFeatureIssueNote, BuiltinIncompleteFeatures,
         BuiltinIncompleteFeaturesHelp, BuiltinInternalFeatures, BuiltinKeywordIdents,
         BuiltinMissingCopyImpl, BuiltinMissingDebugImpl, BuiltinMissingDoc,
-        BuiltinMutablesTransmutes, BuiltinNamedAsmLabel, BuiltinNoMangleGeneric,
+        BuiltinMutablesTransmutes, BuiltinNoMangleGeneric, BuiltinNonShorthandFieldPatterns,
-        BuiltinNonShorthandFieldPatterns, BuiltinSpecialModuleNameUsed, BuiltinTrivialBounds,
+        BuiltinSpecialModuleNameUsed, BuiltinTrivialBounds, BuiltinTypeAliasGenericBounds,
-        BuiltinTypeAliasGenericBounds, BuiltinTypeAliasGenericBoundsSuggestion,
+        BuiltinTypeAliasGenericBoundsSuggestion, BuiltinTypeAliasWhereClause,
-        BuiltinTypeAliasWhereClause, BuiltinUngatedAsyncFnTrackCaller, BuiltinUnpermittedTypeInit,
+        BuiltinUngatedAsyncFnTrackCaller, BuiltinUnpermittedTypeInit,
         BuiltinUnpermittedTypeInitSub, BuiltinUnreachablePub, BuiltinUnsafe,
         BuiltinUnstableFeatures, BuiltinUnusedDocComment, BuiltinUnusedDocCommentSub,
-        BuiltinWhileTrue, SuggestChangingAssocTypes,
+        BuiltinWhileTrue, InvalidAsmLabel, SuggestChangingAssocTypes,
     },
     EarlyContext, EarlyLintPass, LateContext, LateLintPass, Level, LintContext,
 };
@@ -45,7 +45,7 @@ use rustc_ast::tokenstream::{TokenStream, TokenTree};
 use rustc_ast::visit::{FnCtxt, FnKind};
 use rustc_ast::{self as ast, *};
 use rustc_ast_pretty::pprust::{self, expr_to_string};
-use rustc_errors::{Applicability, LintDiagnostic, MultiSpan};
+use rustc_errors::{Applicability, LintDiagnostic};
 use rustc_feature::{deprecated_attributes, AttributeGate, BuiltinAttribute, GateIssue, Stability};
 use rustc_hir as hir;
 use rustc_hir::def::{DefKind, Res};
@@ -69,7 +69,6 @@ use rustc_target::abi::Abi;
 use rustc_trait_selection::infer::{InferCtxtExt, TyCtxtInferExt};
 use rustc_trait_selection::traits::query::evaluate_obligation::InferCtxtExt as _;
 use rustc_trait_selection::traits::{self, misc::type_allowed_to_implement_copy};
-use tracing::debug;
 
 use crate::nonstandard_style::{method_context, MethodLateContext};
 
@@ -2728,10 +2727,52 @@ declare_lint! {
     "named labels in inline assembly",
 }
 
-declare_lint_pass!(NamedAsmLabels => [NAMED_ASM_LABELS]);
+declare_lint! {
+    /// The `binary_asm_labels` lint detects the use of numeric labels containing only binary
+    /// digits in the inline `asm!` macro.
+    ///
+    /// ### Example
+    ///
+    /// ```rust,compile_fail
+    /// # #![feature(asm_experimental_arch)]
+    /// use std::arch::asm;
+    ///
+    /// fn main() {
+    ///     unsafe {
+    ///         asm!("0: jmp 0b");
+    ///     }
+    /// }
+    /// ```
+    ///
+    /// {{produces}}
+    ///
+    /// ### Explanation
+    ///
+    /// A [LLVM bug] causes this code to fail to compile because it interprets the `0b` as a binary
+    /// literal instead of a reference to the previous local label `0`. Note that even though the
+    /// bug is marked as fixed, it only fixes a specific usage of intel syntax within standalone
+    /// files, not inline assembly. To work around this bug, don't use labels that could be
+    /// confused with a binary literal.
+    ///
+    /// See the explanation in [Rust By Example] for more details.
+    ///
+    /// [LLVM bug]: https://bugs.llvm.org/show_bug.cgi?id=36144
+    /// [Rust By Example]: https://doc.rust-lang.org/nightly/rust-by-example/unsafe/asm.html#labels
+    pub BINARY_ASM_LABELS,
+    Deny,
+    "labels in inline assembly containing only 0 or 1 digits",
+}
 
-impl<'tcx> LateLintPass<'tcx> for NamedAsmLabels {
+declare_lint_pass!(AsmLabels => [NAMED_ASM_LABELS, BINARY_ASM_LABELS]);
-    #[allow(rustc::diagnostic_outside_of_impl)]
+
+#[derive(Debug, Clone, Copy, PartialEq, Eq)]
+enum AsmLabelKind {
+    Named,
+    FormatArg,
+    Binary,
+}
+
+impl<'tcx> LateLintPass<'tcx> for AsmLabels {
     fn check_expr(&mut self, cx: &LateContext<'tcx>, expr: &'tcx hir::Expr<'tcx>) {
         if let hir::Expr {
             kind: hir::ExprKind::InlineAsm(hir::InlineAsm { template_strs, options, .. }),
@@ -2759,7 +2800,8 @@ impl<'tcx> LateLintPass<'tcx> for NamedAsmLabels {
                     None
                 };
 
-                let mut found_labels = Vec::new();
+                // diagnostics are emitted per-template, so this is created here as opposed to the outer loop
+                let mut spans = Vec::new();
 
                 // A semicolon might not actually be specified as a separator for all targets, but
                 // it seems like LLVM accepts it always.
@@ -2782,16 +2824,21 @@ impl<'tcx> LateLintPass<'tcx> for NamedAsmLabels {
 
                         // Whether a { bracket has been seen and its } hasn't been found yet.
                         let mut in_bracket = false;
+                        let mut label_kind = AsmLabelKind::Named;
 
-                        // A label starts with an ASCII alphabetic character or . or _
                         // A label can also start with a format arg, if it's not a raw asm block.
                         if !raw && start == '{' {
                             in_bracket = true;
+                            label_kind = AsmLabelKind::FormatArg;
+                        } else if matches!(start, '0' | '1') {
+                            // Binary labels have only the characters `0` or `1`.
+                            label_kind = AsmLabelKind::Binary;
                         } else if !(start.is_ascii_alphabetic() || matches!(start, '.' | '_')) {
+                            // Named labels start with ASCII letters, `.` or `_`.
+                            // anything else is not a label
                             break 'label_loop;
                         }
 
-                        // Labels continue with ASCII alphanumeric characters, _, or $
                         for c in chars {
                             // Inside a template format arg, any character is permitted for the
                             // puproses of label detection because we assume that it can be
@@ -2812,8 +2859,18 @@ impl<'tcx> LateLintPass<'tcx> for NamedAsmLabels {
                             } else if !raw && c == '{' {
                                 // Start of a format arg.
                                 in_bracket = true;
+                                label_kind = AsmLabelKind::FormatArg;
                             } else {
-                                if !(c.is_ascii_alphanumeric() || matches!(c, '_' | '$')) {
+                                let can_continue = match label_kind {
+                                    // Format arg labels are considered to be named labels for the purposes
+                                    // of continuing outside of their {} pair.
+                                    AsmLabelKind::Named | AsmLabelKind::FormatArg => {
+                                        c.is_ascii_alphanumeric() || matches!(c, '_' | '$')
+                                    }
+                                    AsmLabelKind::Binary => matches!(c, '0' | '1'),
+                                };
+
+                                if !can_continue {
                                     // The potential label had an invalid character inside it, it
                                     // cannot be a label.
                                     break 'label_loop;
@@ -2821,25 +2878,41 @@ impl<'tcx> LateLintPass<'tcx> for NamedAsmLabels {
                             }
                         }
 
-                        // If all characters passed the label checks, this is likely a label.
+                        // If all characters passed the label checks, this is a label.
-                        found_labels.push(possible_label);
+                        spans.push((find_label_span(possible_label), label_kind));
                         start_idx = idx + 1;
                     }
                 }
 
-                debug!("NamedAsmLabels::check_expr(): found_labels: {:#?}", &found_labels);
+                for (span, label_kind) in spans {
-
+                    let missing_precise_span = span.is_none();
-                if found_labels.len() > 0 {
+                    let span = span.unwrap_or(*template_span);
-                    let spans = found_labels
+                    match label_kind {
-                        .into_iter()
+                        AsmLabelKind::Named => {
-                        .filter_map(|label| find_label_span(label))
+                            cx.emit_span_lint(
-                        .collect::<Vec<Span>>();
+                                NAMED_ASM_LABELS,
-                    // If there were labels but we couldn't find a span, combine the warnings and
+                                span,
-                    // use the template span.
+                                InvalidAsmLabel::Named { missing_precise_span },
-                    let target_spans: MultiSpan =
+                            );
-                        if spans.len() > 0 { spans.into() } else { (*template_span).into() };
+                        }
-
+                        AsmLabelKind::FormatArg => {
-                    cx.emit_span_lint(NAMED_ASM_LABELS, target_spans, BuiltinNamedAsmLabel);
+                            cx.emit_span_lint(
+                                NAMED_ASM_LABELS,
+                                span,
+                                InvalidAsmLabel::FormatArg { missing_precise_span },
+                            );
+                        }
+                        AsmLabelKind::Binary => {
+                            // the binary asm issue only occurs when using intel syntax
+                            if !options.contains(InlineAsmOptions::ATT_SYNTAX) {
+                                cx.emit_span_lint(
+                                    BINARY_ASM_LABELS,
+                                    span,
+                                    InvalidAsmLabel::Binary { missing_precise_span, span },
+                                )
+                            }
+                        }
+                    };
                 }
             }
         }

compiler/rustc_lint/src/lib.rs

@@ -220,7 +220,7 @@ late_lint_methods!(
             NoopMethodCall: NoopMethodCall,
             EnumIntrinsicsNonEnums: EnumIntrinsicsNonEnums,
             InvalidAtomicOrdering: InvalidAtomicOrdering,
-            NamedAsmLabels: NamedAsmLabels,
+            AsmLabels: AsmLabels,
             OpaqueHiddenInferredBound: OpaqueHiddenInferredBound,
             MultipleSupertraitUpcastable: MultipleSupertraitUpcastable,
             MapUnitFn: MapUnitFn,

compiler/rustc_lint/src/lints.rs

@@ -2040,10 +2040,32 @@ pub struct UnitBindingsDiag {
 }
 
 #[derive(LintDiagnostic)]
-#[diag(lint_builtin_asm_labels)]
+pub enum InvalidAsmLabel {
-#[help]
+    #[diag(lint_invalid_asm_label_named)]
-#[note]
+    #[help]
-pub struct BuiltinNamedAsmLabel;
+    #[note]
+    Named {
+        #[note(lint_invalid_asm_label_no_span)]
+        missing_precise_span: bool,
+    },
+    #[diag(lint_invalid_asm_label_format_arg)]
+    #[help]
+    #[note(lint_note1)]
+    #[note(lint_note2)]
+    FormatArg {
+        #[note(lint_invalid_asm_label_no_span)]
+        missing_precise_span: bool,
+    },
+    #[diag(lint_invalid_asm_label_binary)]
+    #[note]
+    Binary {
+        #[note(lint_invalid_asm_label_no_span)]
+        missing_precise_span: bool,
+        // hack to get a label on the whole span, must match the emitted span
+        #[label]
+        span: Span,
+    },
+}
 
 #[derive(Subdiagnostic)]
 pub enum UnexpectedCfgCargoHelp {

tests/ui/asm/binary_asm_labels.rs

@@ -0,0 +1,17 @@
+//@ needs-asm-support
+//@ only-x86_64
+
+// tests that labels containing only the digits 0 and 1 are rejected
+// uses of such labels can sometimes be interpreted as a binary literal
+
+use std::arch::{asm, global_asm};
+
+fn main() {
+    unsafe {
+        asm!("0: jmp 0b"); //~ ERROR avoid using labels containing only the digits
+        asm!("1: jmp 1b"); //~ ERROR avoid using labels containing only the digits
+        asm!("10: jmp 10b"); //~ ERROR avoid using labels containing only the digits
+        asm!("01: jmp 01b"); //~ ERROR avoid using labels containing only the digits
+        asm!("1001101: jmp 1001101b"); //~ ERROR avoid using labels containing only the digits
+    }
+}

tests/ui/asm/binary_asm_labels.stderr

@@ -0,0 +1,43 @@
+error: avoid using labels containing only the digits `0` and `1` in inline assembly
+  --> $DIR/binary_asm_labels.rs:11:15
+   |
+LL |         asm!("0: jmp 0b");
+   |               ^ use a different label that doesn't start with `0` or `1`
+   |
+   = note: an LLVM bug makes these labels ambiguous with a binary literal number
+   = note: `#[deny(binary_asm_labels)]` on by default
+
+error: avoid using labels containing only the digits `0` and `1` in inline assembly
+  --> $DIR/binary_asm_labels.rs:12:15
+   |
+LL |         asm!("1: jmp 1b");
+   |               ^ use a different label that doesn't start with `0` or `1`
+   |
+   = note: an LLVM bug makes these labels ambiguous with a binary literal number
+
+error: avoid using labels containing only the digits `0` and `1` in inline assembly
+  --> $DIR/binary_asm_labels.rs:13:15
+   |
+LL |         asm!("10: jmp 10b");
+   |               ^^ use a different label that doesn't start with `0` or `1`
+   |
+   = note: an LLVM bug makes these labels ambiguous with a binary literal number
+
+error: avoid using labels containing only the digits `0` and `1` in inline assembly
+  --> $DIR/binary_asm_labels.rs:14:15
+   |
+LL |         asm!("01: jmp 01b");
+   |               ^^ use a different label that doesn't start with `0` or `1`
+   |
+   = note: an LLVM bug makes these labels ambiguous with a binary literal number
+
+error: avoid using labels containing only the digits `0` and `1` in inline assembly
+  --> $DIR/binary_asm_labels.rs:15:15
+   |
+LL |         asm!("1001101: jmp 1001101b");
+   |               ^^^^^^^ use a different label that doesn't start with `0` or `1`
+   |
+   = note: an LLVM bug makes these labels ambiguous with a binary literal number
+
+error: aborting due to 5 previous errors
+

tests/ui/asm/named-asm-labels.rs

@@ -28,11 +28,13 @@ fn main() {
         // Multiple labels on one line
         asm!("foo: bar1: nop");
         //~^ ERROR avoid using named labels
+        //~^^ ERROR avoid using named labels
 
         // Multiple lines
         asm!("foo1: nop", "nop"); //~ ERROR avoid using named labels
         asm!("foo2: foo3: nop", "nop");
         //~^ ERROR avoid using named labels
+        //~^^ ERROR avoid using named labels
         asm!("nop", "foo4: nop"); //~ ERROR avoid using named labels
         asm!("foo5: nop", "foo6: nop");
         //~^ ERROR avoid using named labels
@@ -41,16 +43,19 @@ fn main() {
         // Statement separator
         asm!("foo7: nop; foo8: nop");
         //~^ ERROR avoid using named labels
+        //~^^ ERROR avoid using named labels
         asm!("foo9: nop; nop"); //~ ERROR avoid using named labels
         asm!("nop; foo10: nop"); //~ ERROR avoid using named labels
 
         // Escaped newline
         asm!("bar2: nop\n bar3: nop");
         //~^ ERROR avoid using named labels
+        //~^^ ERROR avoid using named labels
         asm!("bar4: nop\n nop"); //~ ERROR avoid using named labels
         asm!("nop\n bar5: nop"); //~ ERROR avoid using named labels
         asm!("nop\n bar6: bar7: nop");
         //~^ ERROR avoid using named labels
+        //~^^ ERROR avoid using named labels
 
         // Raw strings
         asm!(
@@ -60,6 +65,7 @@ fn main() {
             "
         );
         //~^^^^ ERROR avoid using named labels
+        //~^^^^ ERROR avoid using named labels
 
         asm!(
             r###"
@@ -81,9 +87,15 @@ fn main() {
         asm!("blah1: 2bar: nop"); //~ ERROR avoid using named labels
 
         // Duplicate labels
-        asm!("def: def: nop"); //~ ERROR avoid using named labels
+        asm!("def: def: nop");
-        asm!("def: nop\ndef: nop"); //~ ERROR avoid using named labels
+        //~^ ERROR avoid using named labels
-        asm!("def: nop; def: nop"); //~ ERROR avoid using named labels
+        //~^^ ERROR avoid using named labels
+        asm!("def: nop\ndef: nop");
+        //~^ ERROR avoid using named labels
+        //~^^ ERROR avoid using named labels
+        asm!("def: nop; def: nop");
+        //~^ ERROR avoid using named labels
+        //~^^ ERROR avoid using named labels
 
         // Trying to break parsing
         asm!(":");
@@ -141,7 +153,11 @@ fn main() {
         asm!("{1}: nop", "/* {0} */", const 10, const 20); //~ ERROR avoid using named labels
 
         // Test include_str in asm
-        asm!(include_str!("named-asm-labels.s")); //~ ERROR avoid using named labels
+        asm!(include_str!("named-asm-labels.s"));
+        //~^ ERROR avoid using named labels
+        //~^^ ERROR avoid using named labels
+        //~^^^ ERROR avoid using named labels
+        //~^^^^ ERROR avoid using named labels
 
         // Test allowing or warning on the lint instead
         #[allow(named_asm_labels)]

tests/ui/asm/named-asm-labels.stderr

@@ -21,13 +21,22 @@ error: avoid using named labels in inline assembly
   --> $DIR/named-asm-labels.rs:29:15
    |
 LL |         asm!("foo: bar1: nop");
-   |               ^^^  ^^^^
+   |               ^^^
    |
    = help: only local labels of the form `<number>:` should be used in inline asm
    = note: see the asm section of Rust By Example <https://doc.rust-lang.org/nightly/rust-by-example/unsafe/asm.html#labels> for more information
 
 error: avoid using named labels in inline assembly
-  --> $DIR/named-asm-labels.rs:33:15
+  --> $DIR/named-asm-labels.rs:29:20
+   |
+LL |         asm!("foo: bar1: nop");
+   |                    ^^^^
+   |
+   = help: only local labels of the form `<number>:` should be used in inline asm
+   = note: see the asm section of Rust By Example <https://doc.rust-lang.org/nightly/rust-by-example/unsafe/asm.html#labels> for more information
+
+error: avoid using named labels in inline assembly
+  --> $DIR/named-asm-labels.rs:34:15
    |
 LL |         asm!("foo1: nop", "nop");
    |               ^^^^
@@ -36,16 +45,25 @@ LL |         asm!("foo1: nop", "nop");
    = note: see the asm section of Rust By Example <https://doc.rust-lang.org/nightly/rust-by-example/unsafe/asm.html#labels> for more information
 
 error: avoid using named labels in inline assembly
-  --> $DIR/named-asm-labels.rs:34:15
+  --> $DIR/named-asm-labels.rs:35:15
    |
 LL |         asm!("foo2: foo3: nop", "nop");
-   |               ^^^^  ^^^^
+   |               ^^^^
    |
    = help: only local labels of the form `<number>:` should be used in inline asm
    = note: see the asm section of Rust By Example <https://doc.rust-lang.org/nightly/rust-by-example/unsafe/asm.html#labels> for more information
 
 error: avoid using named labels in inline assembly
-  --> $DIR/named-asm-labels.rs:36:22
+  --> $DIR/named-asm-labels.rs:35:21
+   |
+LL |         asm!("foo2: foo3: nop", "nop");
+   |                     ^^^^
+   |
+   = help: only local labels of the form `<number>:` should be used in inline asm
+   = note: see the asm section of Rust By Example <https://doc.rust-lang.org/nightly/rust-by-example/unsafe/asm.html#labels> for more information
+
+error: avoid using named labels in inline assembly
+  --> $DIR/named-asm-labels.rs:38:22
    |
 LL |         asm!("nop", "foo4: nop");
    |                      ^^^^
@@ -54,7 +72,7 @@ LL |         asm!("nop", "foo4: nop");
    = note: see the asm section of Rust By Example <https://doc.rust-lang.org/nightly/rust-by-example/unsafe/asm.html#labels> for more information
 
 error: avoid using named labels in inline assembly
-  --> $DIR/named-asm-labels.rs:37:15
+  --> $DIR/named-asm-labels.rs:39:15
    |
 LL |         asm!("foo5: nop", "foo6: nop");
    |               ^^^^
@@ -63,7 +81,7 @@ LL |         asm!("foo5: nop", "foo6: nop");
    = note: see the asm section of Rust By Example <https://doc.rust-lang.org/nightly/rust-by-example/unsafe/asm.html#labels> for more information
 
 error: avoid using named labels in inline assembly
-  --> $DIR/named-asm-labels.rs:37:28
+  --> $DIR/named-asm-labels.rs:39:28
    |
 LL |         asm!("foo5: nop", "foo6: nop");
    |                            ^^^^
@@ -72,16 +90,25 @@ LL |         asm!("foo5: nop", "foo6: nop");
    = note: see the asm section of Rust By Example <https://doc.rust-lang.org/nightly/rust-by-example/unsafe/asm.html#labels> for more information
 
 error: avoid using named labels in inline assembly
-  --> $DIR/named-asm-labels.rs:42:15
+  --> $DIR/named-asm-labels.rs:44:15
    |
 LL |         asm!("foo7: nop; foo8: nop");
-   |               ^^^^       ^^^^
+   |               ^^^^
    |
    = help: only local labels of the form `<number>:` should be used in inline asm
    = note: see the asm section of Rust By Example <https://doc.rust-lang.org/nightly/rust-by-example/unsafe/asm.html#labels> for more information
 
 error: avoid using named labels in inline assembly
-  --> $DIR/named-asm-labels.rs:44:15
+  --> $DIR/named-asm-labels.rs:44:26
+   |
+LL |         asm!("foo7: nop; foo8: nop");
+   |                          ^^^^
+   |
+   = help: only local labels of the form `<number>:` should be used in inline asm
+   = note: see the asm section of Rust By Example <https://doc.rust-lang.org/nightly/rust-by-example/unsafe/asm.html#labels> for more information
+
+error: avoid using named labels in inline assembly
+  --> $DIR/named-asm-labels.rs:47:15
    |
 LL |         asm!("foo9: nop; nop");
    |               ^^^^
@@ -90,7 +117,7 @@ LL |         asm!("foo9: nop; nop");
    = note: see the asm section of Rust By Example <https://doc.rust-lang.org/nightly/rust-by-example/unsafe/asm.html#labels> for more information
 
 error: avoid using named labels in inline assembly
-  --> $DIR/named-asm-labels.rs:45:20
+  --> $DIR/named-asm-labels.rs:48:20
    |
 LL |         asm!("nop; foo10: nop");
    |                    ^^^^^
@@ -99,16 +126,25 @@ LL |         asm!("nop; foo10: nop");
    = note: see the asm section of Rust By Example <https://doc.rust-lang.org/nightly/rust-by-example/unsafe/asm.html#labels> for more information
 
 error: avoid using named labels in inline assembly
-  --> $DIR/named-asm-labels.rs:48:15
+  --> $DIR/named-asm-labels.rs:51:15
    |
 LL |         asm!("bar2: nop\n bar3: nop");
-   |               ^^^^        ^^^^
+   |               ^^^^
    |
    = help: only local labels of the form `<number>:` should be used in inline asm
    = note: see the asm section of Rust By Example <https://doc.rust-lang.org/nightly/rust-by-example/unsafe/asm.html#labels> for more information
 
 error: avoid using named labels in inline assembly
-  --> $DIR/named-asm-labels.rs:50:15
+  --> $DIR/named-asm-labels.rs:51:27
+   |
+LL |         asm!("bar2: nop\n bar3: nop");
+   |                           ^^^^
+   |
+   = help: only local labels of the form `<number>:` should be used in inline asm
+   = note: see the asm section of Rust By Example <https://doc.rust-lang.org/nightly/rust-by-example/unsafe/asm.html#labels> for more information
+
+error: avoid using named labels in inline assembly
+  --> $DIR/named-asm-labels.rs:54:15
    |
 LL |         asm!("bar4: nop\n nop");
    |               ^^^^
@@ -117,7 +153,7 @@ LL |         asm!("bar4: nop\n nop");
    = note: see the asm section of Rust By Example <https://doc.rust-lang.org/nightly/rust-by-example/unsafe/asm.html#labels> for more information
 
 error: avoid using named labels in inline assembly
-  --> $DIR/named-asm-labels.rs:51:21
+  --> $DIR/named-asm-labels.rs:55:21
    |
 LL |         asm!("nop\n bar5: nop");
    |                     ^^^^
@@ -126,19 +162,35 @@ LL |         asm!("nop\n bar5: nop");
    = note: see the asm section of Rust By Example <https://doc.rust-lang.org/nightly/rust-by-example/unsafe/asm.html#labels> for more information
 
 error: avoid using named labels in inline assembly
-  --> $DIR/named-asm-labels.rs:52:21
+  --> $DIR/named-asm-labels.rs:56:21
    |
 LL |         asm!("nop\n bar6: bar7: nop");
-   |                     ^^^^  ^^^^
+   |                     ^^^^
    |
    = help: only local labels of the form `<number>:` should be used in inline asm
    = note: see the asm section of Rust By Example <https://doc.rust-lang.org/nightly/rust-by-example/unsafe/asm.html#labels> for more information
 
 error: avoid using named labels in inline assembly
-  --> $DIR/named-asm-labels.rs:58:13
+  --> $DIR/named-asm-labels.rs:56:27
+   |
+LL |         asm!("nop\n bar6: bar7: nop");
+   |                           ^^^^
+   |
+   = help: only local labels of the form `<number>:` should be used in inline asm
+   = note: see the asm section of Rust By Example <https://doc.rust-lang.org/nightly/rust-by-example/unsafe/asm.html#labels> for more information
+
+error: avoid using named labels in inline assembly
+  --> $DIR/named-asm-labels.rs:63:13
    |
 LL |             blah2: nop
    |             ^^^^^
+   |
+   = help: only local labels of the form `<number>:` should be used in inline asm
+   = note: see the asm section of Rust By Example <https://doc.rust-lang.org/nightly/rust-by-example/unsafe/asm.html#labels> for more information
+
+error: avoid using named labels in inline assembly
+  --> $DIR/named-asm-labels.rs:64:13
+   |
 LL |             blah3: nop
    |             ^^^^^
    |
@@ -146,7 +198,7 @@ LL |             blah3: nop
    = note: see the asm section of Rust By Example <https://doc.rust-lang.org/nightly/rust-by-example/unsafe/asm.html#labels> for more information
 
 error: avoid using named labels in inline assembly
-  --> $DIR/named-asm-labels.rs:67:19
+  --> $DIR/named-asm-labels.rs:73:19
    |
 LL |             nop ; blah4: nop
    |                   ^^^^^
@@ -155,7 +207,7 @@ LL |             nop ; blah4: nop
    = note: see the asm section of Rust By Example <https://doc.rust-lang.org/nightly/rust-by-example/unsafe/asm.html#labels> for more information
 
 error: avoid using named labels in inline assembly
-  --> $DIR/named-asm-labels.rs:81:15
+  --> $DIR/named-asm-labels.rs:87:15
    |
 LL |         asm!("blah1: 2bar: nop");
    |               ^^^^^
@@ -164,7 +216,7 @@ LL |         asm!("blah1: 2bar: nop");
    = note: see the asm section of Rust By Example <https://doc.rust-lang.org/nightly/rust-by-example/unsafe/asm.html#labels> for more information
 
 error: avoid using named labels in inline assembly
-  --> $DIR/named-asm-labels.rs:84:15
+  --> $DIR/named-asm-labels.rs:90:15
    |
 LL |         asm!("def: def: nop");
    |               ^^^
@@ -173,7 +225,17 @@ LL |         asm!("def: def: nop");
    = note: see the asm section of Rust By Example <https://doc.rust-lang.org/nightly/rust-by-example/unsafe/asm.html#labels> for more information
 
 error: avoid using named labels in inline assembly
-  --> $DIR/named-asm-labels.rs:85:15
+  --> $DIR/named-asm-labels.rs:90:15
+   |
+LL |         asm!("def: def: nop");
+   |               ^^^
+   |
+   = help: only local labels of the form `<number>:` should be used in inline asm
+   = note: see the asm section of Rust By Example <https://doc.rust-lang.org/nightly/rust-by-example/unsafe/asm.html#labels> for more information
+   = note: duplicate diagnostic emitted due to `-Z deduplicate-diagnostics=no`
+
+error: avoid using named labels in inline assembly
+  --> $DIR/named-asm-labels.rs:93:15
    |
 LL |         asm!("def: nop\ndef: nop");
    |               ^^^
@@ -182,7 +244,17 @@ LL |         asm!("def: nop\ndef: nop");
    = note: see the asm section of Rust By Example <https://doc.rust-lang.org/nightly/rust-by-example/unsafe/asm.html#labels> for more information
 
 error: avoid using named labels in inline assembly
-  --> $DIR/named-asm-labels.rs:86:15
+  --> $DIR/named-asm-labels.rs:93:15
+   |
+LL |         asm!("def: nop\ndef: nop");
+   |               ^^^
+   |
+   = help: only local labels of the form `<number>:` should be used in inline asm
+   = note: see the asm section of Rust By Example <https://doc.rust-lang.org/nightly/rust-by-example/unsafe/asm.html#labels> for more information
+   = note: duplicate diagnostic emitted due to `-Z deduplicate-diagnostics=no`
+
+error: avoid using named labels in inline assembly
+  --> $DIR/named-asm-labels.rs:96:15
    |
 LL |         asm!("def: nop; def: nop");
    |               ^^^
@@ -191,7 +263,17 @@ LL |         asm!("def: nop; def: nop");
    = note: see the asm section of Rust By Example <https://doc.rust-lang.org/nightly/rust-by-example/unsafe/asm.html#labels> for more information
 
 error: avoid using named labels in inline assembly
-  --> $DIR/named-asm-labels.rs:94:15
+  --> $DIR/named-asm-labels.rs:96:15
+   |
+LL |         asm!("def: nop; def: nop");
+   |               ^^^
+   |
+   = help: only local labels of the form `<number>:` should be used in inline asm
+   = note: see the asm section of Rust By Example <https://doc.rust-lang.org/nightly/rust-by-example/unsafe/asm.html#labels> for more information
+   = note: duplicate diagnostic emitted due to `-Z deduplicate-diagnostics=no`
+
+error: avoid using named labels in inline assembly
+  --> $DIR/named-asm-labels.rs:106:15
    |
 LL |         asm!("fooo\u{003A} nop");
    |               ^^^^^^^^^^^^^^^^
@@ -200,7 +282,7 @@ LL |         asm!("fooo\u{003A} nop");
    = note: see the asm section of Rust By Example <https://doc.rust-lang.org/nightly/rust-by-example/unsafe/asm.html#labels> for more information
 
 error: avoid using named labels in inline assembly
-  --> $DIR/named-asm-labels.rs:95:15
+  --> $DIR/named-asm-labels.rs:107:15
    |
 LL |         asm!("foooo\x3A nop");
    |               ^^^^^^^^^^^^^
@@ -209,7 +291,7 @@ LL |         asm!("foooo\x3A nop");
    = note: see the asm section of Rust By Example <https://doc.rust-lang.org/nightly/rust-by-example/unsafe/asm.html#labels> for more information
 
 error: avoid using named labels in inline assembly
-  --> $DIR/named-asm-labels.rs:98:15
+  --> $DIR/named-asm-labels.rs:110:15
    |
 LL |         asm!("fooooo:\u{000A} nop");
    |               ^^^^^^
@@ -218,7 +300,7 @@ LL |         asm!("fooooo:\u{000A} nop");
    = note: see the asm section of Rust By Example <https://doc.rust-lang.org/nightly/rust-by-example/unsafe/asm.html#labels> for more information
 
 error: avoid using named labels in inline assembly
-  --> $DIR/named-asm-labels.rs:99:15
+  --> $DIR/named-asm-labels.rs:111:15
    |
 LL |         asm!("foooooo:\x0A nop");
    |               ^^^^^^^
@@ -227,16 +309,17 @@ LL |         asm!("foooooo:\x0A nop");
    = note: see the asm section of Rust By Example <https://doc.rust-lang.org/nightly/rust-by-example/unsafe/asm.html#labels> for more information
 
 error: avoid using named labels in inline assembly
-  --> $DIR/named-asm-labels.rs:103:14
+  --> $DIR/named-asm-labels.rs:115:14
    |
 LL |         asm!("\x41\x42\x43\x3A\x20\x6E\x6F\x70");
    |              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    |
    = help: only local labels of the form `<number>:` should be used in inline asm
    = note: see the asm section of Rust By Example <https://doc.rust-lang.org/nightly/rust-by-example/unsafe/asm.html#labels> for more information
+   = note: the label may be declared in the expansion of a macro
 
 error: avoid using named labels in inline assembly
-  --> $DIR/named-asm-labels.rs:111:13
+  --> $DIR/named-asm-labels.rs:123:13
    |
 LL |             ab: nop // ab: does foo
    |             ^^
@@ -245,97 +328,140 @@ LL |             ab: nop // ab: does foo
    = note: see the asm section of Rust By Example <https://doc.rust-lang.org/nightly/rust-by-example/unsafe/asm.html#labels> for more information
 
 error: avoid using named labels in inline assembly
-  --> $DIR/named-asm-labels.rs:131:19
+  --> $DIR/named-asm-labels.rs:143:19
    |
 LL |             asm!("test_{}: nop", in(reg) 10);
    |                   ^^^^^^^
    |
    = help: only local labels of the form `<number>:` should be used in inline asm
+   = note: format arguments may expand to a non-numeric value
    = note: see the asm section of Rust By Example <https://doc.rust-lang.org/nightly/rust-by-example/unsafe/asm.html#labels> for more information
 
 error: avoid using named labels in inline assembly
-  --> $DIR/named-asm-labels.rs:133:15
+  --> $DIR/named-asm-labels.rs:145:15
    |
 LL |         asm!("test_{}: nop", const 10);
    |               ^^^^^^^
    |
    = help: only local labels of the form `<number>:` should be used in inline asm
+   = note: format arguments may expand to a non-numeric value
    = note: see the asm section of Rust By Example <https://doc.rust-lang.org/nightly/rust-by-example/unsafe/asm.html#labels> for more information
 
 error: avoid using named labels in inline assembly
-  --> $DIR/named-asm-labels.rs:134:15
+  --> $DIR/named-asm-labels.rs:146:15
    |
 LL |         asm!("test_{}: nop", sym main);
    |               ^^^^^^^
    |
    = help: only local labels of the form `<number>:` should be used in inline asm
+   = note: format arguments may expand to a non-numeric value
    = note: see the asm section of Rust By Example <https://doc.rust-lang.org/nightly/rust-by-example/unsafe/asm.html#labels> for more information
 
 error: avoid using named labels in inline assembly
-  --> $DIR/named-asm-labels.rs:135:15
+  --> $DIR/named-asm-labels.rs:147:15
    |
 LL |         asm!("{}_test: nop", const 10);
    |               ^^^^^^^
    |
    = help: only local labels of the form `<number>:` should be used in inline asm
+   = note: format arguments may expand to a non-numeric value
    = note: see the asm section of Rust By Example <https://doc.rust-lang.org/nightly/rust-by-example/unsafe/asm.html#labels> for more information
 
 error: avoid using named labels in inline assembly
-  --> $DIR/named-asm-labels.rs:136:15
+  --> $DIR/named-asm-labels.rs:148:15
    |
 LL |         asm!("test_{}_test: nop", const 10);
    |               ^^^^^^^^^^^^
    |
    = help: only local labels of the form `<number>:` should be used in inline asm
+   = note: format arguments may expand to a non-numeric value
    = note: see the asm section of Rust By Example <https://doc.rust-lang.org/nightly/rust-by-example/unsafe/asm.html#labels> for more information
 
 error: avoid using named labels in inline assembly
-  --> $DIR/named-asm-labels.rs:137:15
+  --> $DIR/named-asm-labels.rs:149:15
    |
 LL |         asm!("{}: nop", const 10);
    |               ^^
    |
    = help: only local labels of the form `<number>:` should be used in inline asm
+   = note: format arguments may expand to a non-numeric value
    = note: see the asm section of Rust By Example <https://doc.rust-lang.org/nightly/rust-by-example/unsafe/asm.html#labels> for more information
 
 error: avoid using named labels in inline assembly
-  --> $DIR/named-asm-labels.rs:139:15
+  --> $DIR/named-asm-labels.rs:151:15
    |
 LL |         asm!("{uwu}: nop", uwu = const 10);
    |               ^^^^^
    |
    = help: only local labels of the form `<number>:` should be used in inline asm
+   = note: format arguments may expand to a non-numeric value
    = note: see the asm section of Rust By Example <https://doc.rust-lang.org/nightly/rust-by-example/unsafe/asm.html#labels> for more information
 
 error: avoid using named labels in inline assembly
-  --> $DIR/named-asm-labels.rs:140:15
+  --> $DIR/named-asm-labels.rs:152:15
    |
 LL |         asm!("{0}: nop", const 10);
    |               ^^^
    |
    = help: only local labels of the form `<number>:` should be used in inline asm
+   = note: format arguments may expand to a non-numeric value
    = note: see the asm section of Rust By Example <https://doc.rust-lang.org/nightly/rust-by-example/unsafe/asm.html#labels> for more information
 
 error: avoid using named labels in inline assembly
-  --> $DIR/named-asm-labels.rs:141:15
+  --> $DIR/named-asm-labels.rs:153:15
    |
 LL |         asm!("{1}: nop", "/* {0} */", const 10, const 20);
    |               ^^^
    |
    = help: only local labels of the form `<number>:` should be used in inline asm
+   = note: format arguments may expand to a non-numeric value
    = note: see the asm section of Rust By Example <https://doc.rust-lang.org/nightly/rust-by-example/unsafe/asm.html#labels> for more information
 
 error: avoid using named labels in inline assembly
-  --> $DIR/named-asm-labels.rs:144:14
+  --> $DIR/named-asm-labels.rs:156:14
    |
 LL |         asm!(include_str!("named-asm-labels.s"));
    |              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    |
    = help: only local labels of the form `<number>:` should be used in inline asm
    = note: see the asm section of Rust By Example <https://doc.rust-lang.org/nightly/rust-by-example/unsafe/asm.html#labels> for more information
+   = note: the label may be declared in the expansion of a macro
+
+error: avoid using named labels in inline assembly
+  --> $DIR/named-asm-labels.rs:156:14
+   |
+LL |         asm!(include_str!("named-asm-labels.s"));
+   |              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+   |
+   = help: only local labels of the form `<number>:` should be used in inline asm
+   = note: see the asm section of Rust By Example <https://doc.rust-lang.org/nightly/rust-by-example/unsafe/asm.html#labels> for more information
+   = note: the label may be declared in the expansion of a macro
+   = note: duplicate diagnostic emitted due to `-Z deduplicate-diagnostics=no`
+
+error: avoid using named labels in inline assembly
+  --> $DIR/named-asm-labels.rs:156:14
+   |
+LL |         asm!(include_str!("named-asm-labels.s"));
+   |              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+   |
+   = help: only local labels of the form `<number>:` should be used in inline asm
+   = note: see the asm section of Rust By Example <https://doc.rust-lang.org/nightly/rust-by-example/unsafe/asm.html#labels> for more information
+   = note: the label may be declared in the expansion of a macro
+   = note: duplicate diagnostic emitted due to `-Z deduplicate-diagnostics=no`
+
+error: avoid using named labels in inline assembly
+  --> $DIR/named-asm-labels.rs:156:14
+   |
+LL |         asm!(include_str!("named-asm-labels.s"));
+   |              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+   |
+   = help: only local labels of the form `<number>:` should be used in inline asm
+   = note: see the asm section of Rust By Example <https://doc.rust-lang.org/nightly/rust-by-example/unsafe/asm.html#labels> for more information
+   = note: the label may be declared in the expansion of a macro
+   = note: duplicate diagnostic emitted due to `-Z deduplicate-diagnostics=no`
 
 warning: avoid using named labels in inline assembly
-  --> $DIR/named-asm-labels.rs:154:19
+  --> $DIR/named-asm-labels.rs:170:19
    |
 LL |             asm!("warned: nop");
    |                   ^^^^^^
@@ -343,13 +469,13 @@ LL |             asm!("warned: nop");
    = help: only local labels of the form `<number>:` should be used in inline asm
    = note: see the asm section of Rust By Example <https://doc.rust-lang.org/nightly/rust-by-example/unsafe/asm.html#labels> for more information
 note: the lint level is defined here
-  --> $DIR/named-asm-labels.rs:152:16
+  --> $DIR/named-asm-labels.rs:168:16
    |
 LL |         #[warn(named_asm_labels)]
    |                ^^^^^^^^^^^^^^^^
 
 error: avoid using named labels in inline assembly
-  --> $DIR/named-asm-labels.rs:163:20
+  --> $DIR/named-asm-labels.rs:179:20
    |
 LL |     unsafe { asm!(".Lfoo: mov rax, {}; ret;", "nop", const 1, options(noreturn)) }
    |                    ^^^^^
@@ -358,7 +484,7 @@ LL |     unsafe { asm!(".Lfoo: mov rax, {}; ret;", "nop", const 1, options(noret
    = note: see the asm section of Rust By Example <https://doc.rust-lang.org/nightly/rust-by-example/unsafe/asm.html#labels> for more information
 
 error: avoid using named labels in inline assembly
-  --> $DIR/named-asm-labels.rs:169:20
+  --> $DIR/named-asm-labels.rs:185:20
    |
 LL |     unsafe { asm!(".Lbar: mov rax, {}; ret;", "nop", const 1, options(noreturn)) }
    |                    ^^^^^
@@ -367,7 +493,7 @@ LL |     unsafe { asm!(".Lbar: mov rax, {}; ret;", "nop", const 1, options(noret
    = note: see the asm section of Rust By Example <https://doc.rust-lang.org/nightly/rust-by-example/unsafe/asm.html#labels> for more information
 
 error: avoid using named labels in inline assembly
-  --> $DIR/named-asm-labels.rs:177:20
+  --> $DIR/named-asm-labels.rs:193:20
    |
 LL |     unsafe { asm!(".Laaa: nop; ret;", options(noreturn)) }
    |                    ^^^^^
@@ -376,7 +502,7 @@ LL |     unsafe { asm!(".Laaa: nop; ret;", options(noreturn)) }
    = note: see the asm section of Rust By Example <https://doc.rust-lang.org/nightly/rust-by-example/unsafe/asm.html#labels> for more information
 
 error: avoid using named labels in inline assembly
-  --> $DIR/named-asm-labels.rs:187:24
+  --> $DIR/named-asm-labels.rs:203:24
    |
 LL |         unsafe { asm!(".Lbbb: nop; ret;", options(noreturn)) }
    |                        ^^^^^
@@ -385,7 +511,7 @@ LL |         unsafe { asm!(".Lbbb: nop; ret;", options(noreturn)) }
    = note: see the asm section of Rust By Example <https://doc.rust-lang.org/nightly/rust-by-example/unsafe/asm.html#labels> for more information
 
 error: avoid using named labels in inline assembly
-  --> $DIR/named-asm-labels.rs:196:15
+  --> $DIR/named-asm-labels.rs:212:15
    |
 LL |         asm!("closure1: nop");
    |               ^^^^^^^^
@@ -394,7 +520,7 @@ LL |         asm!("closure1: nop");
    = note: see the asm section of Rust By Example <https://doc.rust-lang.org/nightly/rust-by-example/unsafe/asm.html#labels> for more information
 
 error: avoid using named labels in inline assembly
-  --> $DIR/named-asm-labels.rs:200:15
+  --> $DIR/named-asm-labels.rs:216:15
    |
 LL |         asm!("closure2: nop");
    |               ^^^^^^^^
@@ -403,7 +529,7 @@ LL |         asm!("closure2: nop");
    = note: see the asm section of Rust By Example <https://doc.rust-lang.org/nightly/rust-by-example/unsafe/asm.html#labels> for more information
 
 error: avoid using named labels in inline assembly
-  --> $DIR/named-asm-labels.rs:210:19
+  --> $DIR/named-asm-labels.rs:226:19
    |
 LL |             asm!("closure3: nop");
    |                   ^^^^^^^^
@@ -411,5 +537,5 @@ LL |             asm!("closure3: nop");
    = help: only local labels of the form `<number>:` should be used in inline asm
    = note: see the asm section of Rust By Example <https://doc.rust-lang.org/nightly/rust-by-example/unsafe/asm.html#labels> for more information
 
-error: aborting due to 44 previous errors; 1 warning emitted
+error: aborting due to 56 previous errors; 1 warning emitted