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Improve position named arguments lint underline and formatting names

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For named arguments used as implicit position arguments, underline both
the opening curly brace and either:
* if there is formatting, the next character (which will either be the
  closing curl brace or the `:` denoting the start of formatting args)
* if there is no formatting, the entire arg span (important if there is
  whitespace like `{  }`)

This should make it more obvious where the named argument should be.

Additionally, in the lint message, emit the formatting argument names
without a dollar sign to avoid potentially confusion.

Fixes #99907
This commit is contained in:
Preston From 2022-07-29 22:52:46 -06:00
parent 9d5cd21a5d
commit d0ea440dfe
8 changed files with 305 additions and 136 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

86
compiler/rustc_builtin_macros/src/format.rs
View File

@ -16,6 +16,7 @@ use smallvec::SmallVec;
use rustc_lint_defs::builtin::NAMED_ARGUMENTS_USED_POSITIONALLY;
use rustc_lint_defs::{BufferedEarlyLint, BuiltinLintDiagnostics, LintId};
use rustc_parse_format::Count;
use std::borrow::Cow;
use std::collections::hash_map::Entry;
@ -57,26 +58,47 @@ struct PositionalNamedArg {
replacement: Symbol,
/// The span for the positional named argument (so the lint can point a message to it)
positional_named_arg_span: Span,
has_formatting: bool,
}
impl PositionalNamedArg {
/// Determines what span to replace with the name of the named argument
fn get_span_to_replace(&self, cx: &Context<'_, '_>) -> Option<Span> {
/// Determines:
/// 1) span to be replaced with the name of the named argument and
/// 2) span to be underlined for error messages
fn get_positional_arg_spans(&self, cx: &Context<'_, '_>) -> (Option<Span>, Option<Span>) {
if let Some(inner_span) = &self.inner_span_to_replace {
return Some(
cx.fmtsp.from_inner(InnerSpan { start: inner_span.start, end: inner_span.end }),
);
let span =
cx.fmtsp.from_inner(InnerSpan { start: inner_span.start, end: inner_span.end });
(Some(span), Some(span))
} else if self.ty == PositionalNamedArgType::Arg {
// In the case of a named argument whose position is implicit, there will not be a span
// to replace. Instead, we insert the name after the `{`, which is the first character
// of arg_span.
return cx
.arg_spans
.get(self.cur_piece)
.map(|arg_span| arg_span.with_lo(arg_span.lo() + BytePos(1)).shrink_to_lo());
// In the case of a named argument whose position is implicit, if the argument *has*
// formatting, there will not be a span to replace. Instead, we insert the name after
// the `{`, which will be the first character of arg_span. If the argument does *not*
// have formatting, there may or may not be a span to replace. This is because
// whitespace is allowed in arguments without formatting (such as `format!("{ }", 1);`)
// but is not allowed in arguments with formatting (an error will be generated in cases
// like `format!("{ :1.1}", 1.0f32);`.
// For the message span, if there is formatting, we want to use the opening `{` and the
// next character, which will the `:` indicating the start of formatting. If there is
// not any formatting, we want to underline the entire span.
if self.has_formatting {
cx.arg_spans.get(self.cur_piece).map_or((None, None), |arg_span| {
(
Some(arg_span.with_lo(arg_span.lo() + BytePos(1)).shrink_to_lo()),
Some(arg_span.with_hi(arg_span.lo() + BytePos(2))),
)
})
} else {
cx.arg_spans.get(self.cur_piece).map_or((None, None), |arg_span| {
let replace_start = arg_span.lo() + BytePos(1);
let replace_end = arg_span.hi() - BytePos(1);
let to_replace = arg_span.with_lo(replace_start).with_hi(replace_end);
(Some(to_replace), Some(*arg_span))
})
}
} else {
(None, None)
}
None
}
}
@ -117,10 +139,18 @@ impl PositionalNamedArgsLint {
cur_piece: usize,
inner_span_to_replace: Option<rustc_parse_format::InnerSpan>,
names: &FxHashMap<Symbol, (usize, Span)>,
has_formatting: bool,
) {
let start_of_named_args = total_args_length - names.len();
if current_positional_arg >= start_of_named_args {
self.maybe_push(format_argument_index, ty, cur_piece, inner_span_to_replace, names)
self.maybe_push(
format_argument_index,
ty,
cur_piece,
inner_span_to_replace,
names,
has_formatting,
)
}
}
@ -134,6 +164,7 @@ impl PositionalNamedArgsLint {
cur_piece: usize,
inner_span_to_replace: Option<rustc_parse_format::InnerSpan>,
names: &FxHashMap<Symbol, (usize, Span)>,
has_formatting: bool,
) {
let named_arg = names
.iter()
@ -156,6 +187,7 @@ impl PositionalNamedArgsLint {
inner_span_to_replace,
replacement,
positional_named_arg_span,
has_formatting,
});
}
}
@ -414,6 +446,9 @@ impl<'a, 'b> Context<'a, 'b> {
PositionalNamedArgType::Precision,
);
let has_precision = arg.format.precision != Count::CountImplied;
let has_width = arg.format.width != Count::CountImplied;
// argument second, if it's an implicit positional parameter
// it's written second, so it should come after width/precision.
let pos = match arg.position {
@ -426,6 +461,7 @@ impl<'a, 'b> Context<'a, 'b> {
self.curpiece,
arg_end,
&self.names,
has_precision || has_width,
);
Exact(i)
@ -439,6 +475,7 @@ impl<'a, 'b> Context<'a, 'b> {
self.curpiece,
None,
&self.names,
has_precision || has_width,
);
Exact(i)
}
@ -529,6 +566,7 @@ impl<'a, 'b> Context<'a, 'b> {
self.curpiece,
*inner_span,
&self.names,
true,
);
self.verify_arg_type(Exact(i), Count);
}
@ -1150,24 +1188,22 @@ pub fn expand_format_args_nl<'cx>(
fn create_lints_for_named_arguments_used_positionally(cx: &mut Context<'_, '_>) {
for named_arg in &cx.unused_names_lint.positional_named_args {
let arg_span = named_arg.get_span_to_replace(cx);
let (position_sp_to_replace, position_sp_for_msg) = named_arg.get_positional_arg_spans(cx);
let msg = format!("named argument `{}` is not used by name", named_arg.replacement);
let replacement = match named_arg.ty {
PositionalNamedArgType::Arg => named_arg.replacement.to_string(),
_ => named_arg.replacement.to_string() + "$",
};
cx.ecx.buffered_early_lint.push(BufferedEarlyLint {
span: MultiSpan::from_span(named_arg.positional_named_arg_span),
msg: msg.clone(),
node_id: ast::CRATE_NODE_ID,
lint_id: LintId::of(&NAMED_ARGUMENTS_USED_POSITIONALLY),
diagnostic: BuiltinLintDiagnostics::NamedArgumentUsedPositionally(
arg_span,
named_arg.positional_named_arg_span,
replacement,
),
diagnostic: BuiltinLintDiagnostics::NamedArgumentUsedPositionally {
position_sp_to_replace,
position_sp_for_msg,
named_arg_sp: named_arg.positional_named_arg_span,
named_arg_name: named_arg.replacement.to_string(),
is_formatting_arg: named_arg.ty != PositionalNamedArgType::Arg,
},
});
}
}

17
compiler/rustc_lint/src/context.rs
View File

@ -856,13 +856,18 @@ pub trait LintContext: Sized {
Applicability::MachineApplicable,
);
},
BuiltinLintDiagnostics::NamedArgumentUsedPositionally(positional_arg, named_arg, name) => {
db.span_label(named_arg, "this named argument is only referred to by position in formatting string");
if let Some(positional_arg) = positional_arg {
let msg = format!("this formatting argument uses named argument `{}` by position", name);
db.span_label(positional_arg, msg);
BuiltinLintDiagnostics::NamedArgumentUsedPositionally{ position_sp_to_replace, position_sp_for_msg, named_arg_sp, named_arg_name, is_formatting_arg} => {
db.span_label(named_arg_sp, "this named argument is referred to by position in formatting string");
if let Some(positional_arg_for_msg) = position_sp_for_msg {
let msg = format!("this formatting argument uses named argument `{}` by position", named_arg_name);
db.span_label(positional_arg_for_msg, msg);
}
if let Some(positional_arg_to_replace) = position_sp_to_replace {
let name = if is_formatting_arg { named_arg_name + "$" } else { named_arg_name };
db.span_suggestion_verbose(
positional_arg,
positional_arg_to_replace,
"use the named argument by name to avoid ambiguity",
name,
Applicability::MaybeIncorrect,

14
compiler/rustc_lint_defs/src/lib.rs
View File

@ -467,7 +467,19 @@ pub enum BuiltinLintDiagnostics {
/// If true, the lifetime will be fully elided.
use_span: Option<(Span, bool)>,
},
NamedArgumentUsedPositionally(Option<Span>, Span, String),
NamedArgumentUsedPositionally {
/// Span where the named argument is used by position and will be replaced with the named
/// argument name
position_sp_to_replace: Option<Span>,
/// Span where the named argument is used by position and is used for lint messages
position_sp_for_msg: Option<Span>,
/// Span where the named argument's name is (so we know where to put the warning message)
named_arg_sp: Span,
/// String containing the named arguments name
named_arg_name: String,
/// Indicates if the named argument is used as a width/precision for formatting
is_formatting_arg: bool,
},
}
/// Lints that are buffered up early on in the `Session` before the

36
src/test/ui/macros/issue-98466.stderr
View File

@ -2,9 +2,9 @@ warning: named argument `_x` is not used by name
--> $DIR/issue-98466.rs:7:26
|
LL | println!("_x is {}", _x = 5);
| - ^^ this named argument is only referred to by position in formatting string
| |
| this formatting argument uses named argument `_x` by position
| -- ^^ this named argument is referred to by position in formatting string
| |
| this formatting argument uses named argument `_x` by position
|
= note: `#[warn(named_arguments_used_positionally)]` on by default
help: use the named argument by name to avoid ambiguity
@ -16,9 +16,9 @@ warning: named argument `y` is not used by name
--> $DIR/issue-98466.rs:10:26
|
LL | println!("_x is {}", y = _x);
| - ^ this named argument is only referred to by position in formatting string
| |
| this formatting argument uses named argument `y` by position
| -- ^ this named argument is referred to by position in formatting string
| |
| this formatting argument uses named argument `y` by position
|
help: use the named argument by name to avoid ambiguity
|
@ -29,9 +29,9 @@ warning: named argument `y` is not used by name
--> $DIR/issue-98466.rs:13:83
|
LL | println!("first positional arg {}, second positional arg {}, _x is {}", 1, 2, y = _x);
| - ^ this named argument is only referred to by position in formatting string
| |
| this formatting argument uses named argument `y` by position
| -- ^ this named argument is referred to by position in formatting string
| |
| this formatting argument uses named argument `y` by position
|
help: use the named argument by name to avoid ambiguity
|
@ -42,9 +42,9 @@ warning: named argument `_x` is not used by name
--> $DIR/issue-98466.rs:19:34
|
LL | let _f = format!("_x is {}", _x = 5);
| - ^^ this named argument is only referred to by position in formatting string
| |
| this formatting argument uses named argument `_x` by position
| -- ^^ this named argument is referred to by position in formatting string
| |
| this formatting argument uses named argument `_x` by position
|
help: use the named argument by name to avoid ambiguity
|
@ -55,9 +55,9 @@ warning: named argument `y` is not used by name
--> $DIR/issue-98466.rs:22:34
|
LL | let _f = format!("_x is {}", y = _x);
| - ^ this named argument is only referred to by position in formatting string
| |
| this formatting argument uses named argument `y` by position
| -- ^ this named argument is referred to by position in formatting string
| |
| this formatting argument uses named argument `y` by position
|
help: use the named argument by name to avoid ambiguity
|
@ -68,9 +68,9 @@ warning: named argument `y` is not used by name
--> $DIR/issue-98466.rs:25:91
|
LL | let _f = format!("first positional arg {}, second positional arg {}, _x is {}", 1, 2, y = _x);
| - ^ this named argument is only referred to by position in formatting string
| |
| this formatting argument uses named argument `y` by position
| -- ^ this named argument is referred to by position in formatting string
| |
| this formatting argument uses named argument `y` by position
|
help: use the named argument by name to avoid ambiguity
|

172
src/test/ui/macros/issue-99265.stderr
View File

@ -2,9 +2,9 @@ warning: named argument `a` is not used by name
--> $DIR/issue-99265.rs:5:24
|
LL | println!("{b} {}", a=1, b=2);
| - ^ this named argument is only referred to by position in formatting string
| |
| this formatting argument uses named argument `a` by position
| -- ^ this named argument is referred to by position in formatting string
| |
| this formatting argument uses named argument `a` by position
|
= note: `#[warn(named_arguments_used_positionally)]` on by default
help: use the named argument by name to avoid ambiguity
@ -16,9 +16,9 @@ warning: named argument `a` is not used by name
--> $DIR/issue-99265.rs:9:35
|
LL | println!("{} {} {} {} {}", 0, a=1, b=2, c=3, d=4);
| - ^ this named argument is only referred to by position in formatting string
| |
| this formatting argument uses named argument `a` by position
| -- ^ this named argument is referred to by position in formatting string
| |
| this formatting argument uses named argument `a` by position
|
help: use the named argument by name to avoid ambiguity
|
@ -29,9 +29,9 @@ warning: named argument `b` is not used by name
--> $DIR/issue-99265.rs:9:40
|
LL | println!("{} {} {} {} {}", 0, a=1, b=2, c=3, d=4);
| - ^ this named argument is only referred to by position in formatting string
| |
| this formatting argument uses named argument `b` by position
| -- ^ this named argument is referred to by position in formatting string
| |
| this formatting argument uses named argument `b` by position
|
help: use the named argument by name to avoid ambiguity
|
@ -42,9 +42,9 @@ warning: named argument `c` is not used by name
--> $DIR/issue-99265.rs:9:45
|
LL | println!("{} {} {} {} {}", 0, a=1, b=2, c=3, d=4);
| - ^ this named argument is only referred to by position in formatting string
| |
| this formatting argument uses named argument `c` by position
| -- ^ this named argument is referred to by position in formatting string
| |
| this formatting argument uses named argument `c` by position
|
help: use the named argument by name to avoid ambiguity
|
@ -55,9 +55,9 @@ warning: named argument `d` is not used by name
--> $DIR/issue-99265.rs:9:50
|
LL | println!("{} {} {} {} {}", 0, a=1, b=2, c=3, d=4);
| - ^ this named argument is only referred to by position in formatting string
| |
| this formatting argument uses named argument `d` by position
| -- ^ this named argument is referred to by position in formatting string
| |
| this formatting argument uses named argument `d` by position
|
help: use the named argument by name to avoid ambiguity
|
@ -68,9 +68,9 @@ warning: named argument `width` is not used by name
--> $DIR/issue-99265.rs:19:35
|
LL | println!("Hello {:1$}!", "x", width = 5);
| -- ^^^^^ this named argument is only referred to by position in formatting string
| -- ^^^^^ this named argument is referred to by position in formatting string
| |
| this formatting argument uses named argument `width$` by position
| this formatting argument uses named argument `width` by position
|
help: use the named argument by name to avoid ambiguity
|
@ -81,9 +81,9 @@ warning: named argument `width` is not used by name
--> $DIR/issue-99265.rs:23:46
|
LL | println!("Hello {:1$.2$}!", f = 0.02f32, width = 5, precision = 2);
| -- ^^^^^ this named argument is only referred to by position in formatting string
| -- ^^^^^ this named argument is referred to by position in formatting string
| |
| this formatting argument uses named argument `width$` by position
| this formatting argument uses named argument `width` by position
|
help: use the named argument by name to avoid ambiguity
|
@ -94,9 +94,9 @@ warning: named argument `precision` is not used by name
--> $DIR/issue-99265.rs:23:57
|
LL | println!("Hello {:1$.2$}!", f = 0.02f32, width = 5, precision = 2);
| -- ^^^^^^^^^ this named argument is only referred to by position in formatting string
| -- ^^^^^^^^^ this named argument is referred to by position in formatting string
| |
| this formatting argument uses named argument `precision$` by position
| this formatting argument uses named argument `precision` by position
|
help: use the named argument by name to avoid ambiguity
|
@ -107,9 +107,9 @@ warning: named argument `f` is not used by name
--> $DIR/issue-99265.rs:23:33
|
LL | println!("Hello {:1$.2$}!", f = 0.02f32, width = 5, precision = 2);
| - ^ this named argument is only referred to by position in formatting string
| |
| this formatting argument uses named argument `f` by position
| -- ^ this named argument is referred to by position in formatting string
| |
| this formatting argument uses named argument `f` by position
|
help: use the named argument by name to avoid ambiguity
|
@ -120,9 +120,9 @@ warning: named argument `width` is not used by name
--> $DIR/issue-99265.rs:31:47
|
LL | println!("Hello {0:1$.2$}!", f = 0.02f32, width = 5, precision = 2);
| -- ^^^^^ this named argument is only referred to by position in formatting string
| -- ^^^^^ this named argument is referred to by position in formatting string
| |
| this formatting argument uses named argument `width$` by position
| this formatting argument uses named argument `width` by position
|
help: use the named argument by name to avoid ambiguity
|
@ -133,9 +133,9 @@ warning: named argument `precision` is not used by name
--> $DIR/issue-99265.rs:31:58
|
LL | println!("Hello {0:1$.2$}!", f = 0.02f32, width = 5, precision = 2);
| -- ^^^^^^^^^ this named argument is only referred to by position in formatting string
| -- ^^^^^^^^^ this named argument is referred to by position in formatting string
| |
| this formatting argument uses named argument `precision$` by position
| this formatting argument uses named argument `precision` by position
|
help: use the named argument by name to avoid ambiguity
|
@ -146,7 +146,7 @@ warning: named argument `f` is not used by name
--> $DIR/issue-99265.rs:31:34
|
LL | println!("Hello {0:1$.2$}!", f = 0.02f32, width = 5, precision = 2);
| - ^ this named argument is only referred to by position in formatting string
| - ^ this named argument is referred to by position in formatting string
| |
| this formatting argument uses named argument `f` by position
|
@ -159,10 +159,10 @@ warning: named argument `width` is not used by name
--> $DIR/issue-99265.rs:52:9
|
LL | "{}, Hello {1:2$.3$} {4:5$.6$}! {1}",
| -- this formatting argument uses named argument `width$` by position
| -- this formatting argument uses named argument `width` by position
...
LL | width = 5,
| ^^^^^ this named argument is only referred to by position in formatting string
| ^^^^^ this named argument is referred to by position in formatting string
|
help: use the named argument by name to avoid ambiguity
|
@ -173,10 +173,10 @@ warning: named argument `precision` is not used by name
--> $DIR/issue-99265.rs:54:9
|
LL | "{}, Hello {1:2$.3$} {4:5$.6$}! {1}",
| -- this formatting argument uses named argument `precision$` by position
| -- this formatting argument uses named argument `precision` by position
...
LL | precision = 2,
| ^^^^^^^^^ this named argument is only referred to by position in formatting string
| ^^^^^^^^^ this named argument is referred to by position in formatting string
|
help: use the named argument by name to avoid ambiguity
|
@ -190,7 +190,7 @@ LL | "{}, Hello {1:2$.3$} {4:5$.6$}! {1}",
| - this formatting argument uses named argument `f` by position
...
LL | f = 0.02f32,
| ^ this named argument is only referred to by position in formatting string
| ^ this named argument is referred to by position in formatting string
|
help: use the named argument by name to avoid ambiguity
|
@ -201,10 +201,10 @@ warning: named argument `width2` is not used by name
--> $DIR/issue-99265.rs:58:9
|
LL | "{}, Hello {1:2$.3$} {4:5$.6$}! {1}",
| -- this formatting argument uses named argument `width2$` by position
| -- this formatting argument uses named argument `width2` by position
...
LL | width2 = 5,
| ^^^^^^ this named argument is only referred to by position in formatting string
| ^^^^^^ this named argument is referred to by position in formatting string
|
help: use the named argument by name to avoid ambiguity
|
@ -215,10 +215,10 @@ warning: named argument `precision2` is not used by name
--> $DIR/issue-99265.rs:60:9
|
LL | "{}, Hello {1:2$.3$} {4:5$.6$}! {1}",
| -- this formatting argument uses named argument `precision2$` by position
| -- this formatting argument uses named argument `precision2` by position
...
LL | precision2 = 2
| ^^^^^^^^^^ this named argument is only referred to by position in formatting string
| ^^^^^^^^^^ this named argument is referred to by position in formatting string
|
help: use the named argument by name to avoid ambiguity
|
@ -232,7 +232,7 @@ LL | "{}, Hello {1:2$.3$} {4:5$.6$}! {1}",
| - this formatting argument uses named argument `g` by position
...
LL | g = 0.02f32,
| ^ this named argument is only referred to by position in formatting string
| ^ this named argument is referred to by position in formatting string
|
help: use the named argument by name to avoid ambiguity
|
@ -246,7 +246,7 @@ LL | "{}, Hello {1:2$.3$} {4:5$.6$}! {1}",
| - this formatting argument uses named argument `f` by position
...
LL | f = 0.02f32,
| ^ this named argument is only referred to by position in formatting string
| ^ this named argument is referred to by position in formatting string
|
help: use the named argument by name to avoid ambiguity
|
@ -257,9 +257,9 @@ warning: named argument `f` is not used by name
--> $DIR/issue-99265.rs:64:31
|
LL | println!("Hello {:0.1}!", f = 0.02f32);
| - ^ this named argument is only referred to by position in formatting string
| |
| this formatting argument uses named argument `f` by position
| -- ^ this named argument is referred to by position in formatting string
| |
| this formatting argument uses named argument `f` by position
|
help: use the named argument by name to avoid ambiguity
|
@ -270,7 +270,7 @@ warning: named argument `f` is not used by name
--> $DIR/issue-99265.rs:68:32
|
LL | println!("Hello {0:0.1}!", f = 0.02f32);
| - ^ this named argument is only referred to by position in formatting string
| - ^ this named argument is referred to by position in formatting string
| |
| this formatting argument uses named argument `f` by position
|
@ -283,9 +283,9 @@ warning: named argument `v` is not used by name
--> $DIR/issue-99265.rs:79:23
|
LL | println!("{:0$}", v = val);
| -- ^ this named argument is only referred to by position in formatting string
| -- ^ this named argument is referred to by position in formatting string
| |
| this formatting argument uses named argument `v$` by position
| this formatting argument uses named argument `v` by position
|
help: use the named argument by name to avoid ambiguity
|
@ -296,9 +296,9 @@ warning: named argument `v` is not used by name
--> $DIR/issue-99265.rs:79:23
|
LL | println!("{:0$}", v = val);
| - ^ this named argument is only referred to by position in formatting string
| |
| this formatting argument uses named argument `v` by position
| -- ^ this named argument is referred to by position in formatting string
| |
| this formatting argument uses named argument `v` by position
|
help: use the named argument by name to avoid ambiguity
|
@ -309,9 +309,9 @@ warning: named argument `v` is not used by name
--> $DIR/issue-99265.rs:84:24
|
LL | println!("{0:0$}", v = val);
| -- ^ this named argument is only referred to by position in formatting string
| -- ^ this named argument is referred to by position in formatting string
| |
| this formatting argument uses named argument `v$` by position
| this formatting argument uses named argument `v` by position
|
help: use the named argument by name to avoid ambiguity
|
@ -322,7 +322,7 @@ warning: named argument `v` is not used by name
--> $DIR/issue-99265.rs:84:24
|
LL | println!("{0:0$}", v = val);
| - ^ this named argument is only referred to by position in formatting string
| - ^ this named argument is referred to by position in formatting string
| |
| this formatting argument uses named argument `v` by position
|
@ -335,9 +335,9 @@ warning: named argument `v` is not used by name
--> $DIR/issue-99265.rs:89:26
|
LL | println!("{:0$.0$}", v = val);
| -- ^ this named argument is only referred to by position in formatting string
| -- ^ this named argument is referred to by position in formatting string
| |
| this formatting argument uses named argument `v$` by position
| this formatting argument uses named argument `v` by position
|
help: use the named argument by name to avoid ambiguity
|
@ -348,9 +348,9 @@ warning: named argument `v` is not used by name
--> $DIR/issue-99265.rs:89:26
|
LL | println!("{:0$.0$}", v = val);
| -- ^ this named argument is only referred to by position in formatting string
| -- ^ this named argument is referred to by position in formatting string
| |
| this formatting argument uses named argument `v$` by position
| this formatting argument uses named argument `v` by position
|
help: use the named argument by name to avoid ambiguity
|
@ -361,9 +361,9 @@ warning: named argument `v` is not used by name
--> $DIR/issue-99265.rs:89:26
|
LL | println!("{:0$.0$}", v = val);
| - ^ this named argument is only referred to by position in formatting string
| |
| this formatting argument uses named argument `v` by position
| -- ^ this named argument is referred to by position in formatting string
| |
| this formatting argument uses named argument `v` by position
|
help: use the named argument by name to avoid ambiguity
|
@ -374,9 +374,9 @@ warning: named argument `v` is not used by name
--> $DIR/issue-99265.rs:96:27
|
LL | println!("{0:0$.0$}", v = val);
| -- ^ this named argument is only referred to by position in formatting string
| -- ^ this named argument is referred to by position in formatting string
| |
| this formatting argument uses named argument `v$` by position
| this formatting argument uses named argument `v` by position
|
help: use the named argument by name to avoid ambiguity
|
@ -387,9 +387,9 @@ warning: named argument `v` is not used by name
--> $DIR/issue-99265.rs:96:27
|
LL | println!("{0:0$.0$}", v = val);
| -- ^ this named argument is only referred to by position in formatting string
| -- ^ this named argument is referred to by position in formatting string
| |
| this formatting argument uses named argument `v$` by position
| this formatting argument uses named argument `v` by position
|
help: use the named argument by name to avoid ambiguity
|
@ -400,7 +400,7 @@ warning: named argument `v` is not used by name
--> $DIR/issue-99265.rs:96:27
|
LL | println!("{0:0$.0$}", v = val);
| - ^ this named argument is only referred to by position in formatting string
| - ^ this named argument is referred to by position in formatting string
| |
| this formatting argument uses named argument `v` by position
|
@ -413,9 +413,9 @@ warning: named argument `a` is not used by name
--> $DIR/issue-99265.rs:104:28
|
LL | println!("{} {a} {0}", a = 1);
| - ^ this named argument is only referred to by position in formatting string
| |
| this formatting argument uses named argument `a` by position
| -- ^ this named argument is referred to by position in formatting string
| |
| this formatting argument uses named argument `a` by position
|
help: use the named argument by name to avoid ambiguity
|
@ -426,7 +426,7 @@ warning: named argument `a` is not used by name
--> $DIR/issue-99265.rs:104:28
|
LL | println!("{} {a} {0}", a = 1);
| - ^ this named argument is only referred to by position in formatting string
| - ^ this named argument is referred to by position in formatting string
| |
| this formatting argument uses named argument `a` by position
|
@ -439,10 +439,10 @@ warning: named argument `b` is not used by name
--> $DIR/issue-99265.rs:115:23
|
LL | {:1$.2$}",
| -- this formatting argument uses named argument `b$` by position
| -- this formatting argument uses named argument `b` by position
...
LL | a = 1.0, b = 1, c = 2,
| ^ this named argument is only referred to by position in formatting string
| ^ this named argument is referred to by position in formatting string
|
help: use the named argument by name to avoid ambiguity
|
@ -453,10 +453,10 @@ warning: named argument `c` is not used by name
--> $DIR/issue-99265.rs:115:30
|
LL | {:1$.2$}",
| -- this formatting argument uses named argument `c$` by position
| -- this formatting argument uses named argument `c` by position
...
LL | a = 1.0, b = 1, c = 2,
| ^ this named argument is only referred to by position in formatting string
| ^ this named argument is referred to by position in formatting string
|
help: use the named argument by name to avoid ambiguity
|
@ -467,10 +467,10 @@ warning: named argument `a` is not used by name
--> $DIR/issue-99265.rs:115:14
|
LL | {:1$.2$}",
| - this formatting argument uses named argument `a` by position
| -- this formatting argument uses named argument `a` by position
...
LL | a = 1.0, b = 1, c = 2,
| ^ this named argument is only referred to by position in formatting string
| ^ this named argument is referred to by position in formatting string
|
help: use the named argument by name to avoid ambiguity
|
@ -481,10 +481,10 @@ warning: named argument `b` is not used by name
--> $DIR/issue-99265.rs:126:23
|
LL | {0:1$.2$}",
| -- this formatting argument uses named argument `b$` by position
| -- this formatting argument uses named argument `b` by position
...
LL | a = 1.0, b = 1, c = 2,
| ^ this named argument is only referred to by position in formatting string
| ^ this named argument is referred to by position in formatting string
|
help: use the named argument by name to avoid ambiguity
|
@ -495,10 +495,10 @@ warning: named argument `c` is not used by name
--> $DIR/issue-99265.rs:126:30
|
LL | {0:1$.2$}",
| -- this formatting argument uses named argument `c$` by position
| -- this formatting argument uses named argument `c` by position
...
LL | a = 1.0, b = 1, c = 2,
| ^ this named argument is only referred to by position in formatting string
| ^ this named argument is referred to by position in formatting string
|
help: use the named argument by name to avoid ambiguity
|
@ -512,7 +512,7 @@ LL | {0:1$.2$}",
| - this formatting argument uses named argument `a` by position
...
LL | a = 1.0, b = 1, c = 2,
| ^ this named argument is only referred to by position in formatting string
| ^ this named argument is referred to by position in formatting string
|
help: use the named argument by name to avoid ambiguity
|
@ -523,9 +523,9 @@ warning: named argument `width` is not used by name
--> $DIR/issue-99265.rs:132:39
|
LL | println!("{{{:1$.2$}}}", x = 1.0, width = 3, precision = 2);
| -- ^^^^^ this named argument is only referred to by position in formatting string
| -- ^^^^^ this named argument is referred to by position in formatting string
| |
| this formatting argument uses named argument `width$` by position
| this formatting argument uses named argument `width` by position
|
help: use the named argument by name to avoid ambiguity
|
@ -536,9 +536,9 @@ warning: named argument `precision` is not used by name
--> $DIR/issue-99265.rs:132:50
|
LL | println!("{{{:1$.2$}}}", x = 1.0, width = 3, precision = 2);
| -- ^^^^^^^^^ this named argument is only referred to by position in formatting string
| -- ^^^^^^^^^ this named argument is referred to by position in formatting string
| |
| this formatting argument uses named argument `precision$` by position
| this formatting argument uses named argument `precision` by position
|
help: use the named argument by name to avoid ambiguity
|
@ -549,9 +549,9 @@ warning: named argument `x` is not used by name
--> $DIR/issue-99265.rs:132:30
|
LL | println!("{{{:1$.2$}}}", x = 1.0, width = 3, precision = 2);
| - ^ this named argument is only referred to by position in formatting string
| |
| this formatting argument uses named argument `x` by position
| -- ^ this named argument is referred to by position in formatting string
| |
| this formatting argument uses named argument `x` by position
|
help: use the named argument by name to avoid ambiguity
|

24
src/test/ui/macros/issue-99907.fixed Normal file
View File

@ -0,0 +1,24 @@
// check-pass
// run-rustfix
fn main() {
println!("Hello {f:.1}!", f = 0.02f32);
//~^ WARNING named argument `f` is not used by name [named_arguments_used_positionally]
//~| HELP use the named argument by name to avoid ambiguity
println!("Hello {f:1.1}!", f = 0.02f32);
//~^ WARNING named argument `f` is not used by name [named_arguments_used_positionally]
//~| HELP use the named argument by name to avoid ambiguity
println!("Hello {f}!", f = 0.02f32);
//~^ WARNING named argument `f` is not used by name [named_arguments_used_positionally]
//~| HELP use the named argument by name to avoid ambiguity
println!("Hello {f}!", f = 0.02f32);
//~^ WARNING named argument `f` is not used by name [named_arguments_used_positionally]
//~| HELP use the named argument by name to avoid ambiguity
println!("Hello {f}!", f = 0.02f32);
//~^ WARNING named argument `f` is not used by name [named_arguments_used_positionally]
//~| HELP use the named argument by name to avoid ambiguity
}

24
src/test/ui/macros/issue-99907.rs Normal file
View File

@ -0,0 +1,24 @@
// check-pass
// run-rustfix
fn main() {
println!("Hello {:.1}!", f = 0.02f32);
//~^ WARNING named argument `f` is not used by name [named_arguments_used_positionally]
//~| HELP use the named argument by name to avoid ambiguity
println!("Hello {:1.1}!", f = 0.02f32);
//~^ WARNING named argument `f` is not used by name [named_arguments_used_positionally]
//~| HELP use the named argument by name to avoid ambiguity
println!("Hello {}!", f = 0.02f32);
//~^ WARNING named argument `f` is not used by name [named_arguments_used_positionally]
//~| HELP use the named argument by name to avoid ambiguity
println!("Hello { }!", f = 0.02f32);
//~^ WARNING named argument `f` is not used by name [named_arguments_used_positionally]
//~| HELP use the named argument by name to avoid ambiguity
println!("Hello { }!", f = 0.02f32);
//~^ WARNING named argument `f` is not used by name [named_arguments_used_positionally]
//~| HELP use the named argument by name to avoid ambiguity
}

68
src/test/ui/macros/issue-99907.stderr Normal file
View File

@ -0,0 +1,68 @@
warning: named argument `f` is not used by name
--> $DIR/issue-99907.rs:5:30
|
LL | println!("Hello {:.1}!", f = 0.02f32);
| -- ^ this named argument is referred to by position in formatting string
| |
| this formatting argument uses named argument `f` by position
|
= note: `#[warn(named_arguments_used_positionally)]` on by default
help: use the named argument by name to avoid ambiguity
|
LL | println!("Hello {f:.1}!", f = 0.02f32);
| +
warning: named argument `f` is not used by name
--> $DIR/issue-99907.rs:9:31
|
LL | println!("Hello {:1.1}!", f = 0.02f32);
| -- ^ this named argument is referred to by position in formatting string
| |
| this formatting argument uses named argument `f` by position
|
help: use the named argument by name to avoid ambiguity
|
LL | println!("Hello {f:1.1}!", f = 0.02f32);
| +
warning: named argument `f` is not used by name
--> $DIR/issue-99907.rs:13:27
|
LL | println!("Hello {}!", f = 0.02f32);
| -- ^ this named argument is referred to by position in formatting string
| |
| this formatting argument uses named argument `f` by position
|
help: use the named argument by name to avoid ambiguity
|
LL | println!("Hello {f}!", f = 0.02f32);
| +
warning: named argument `f` is not used by name
--> $DIR/issue-99907.rs:17:28
|
LL | println!("Hello { }!", f = 0.02f32);
| --- ^ this named argument is referred to by position in formatting string
| |
| this formatting argument uses named argument `f` by position
|
help: use the named argument by name to avoid ambiguity
|
LL | println!("Hello {f}!", f = 0.02f32);
| +
warning: named argument `f` is not used by name
--> $DIR/issue-99907.rs:21:29
|
LL | println!("Hello { }!", f = 0.02f32);
| ---- ^ this named argument is referred to by position in formatting string
| |
| this formatting argument uses named argument `f` by position
|
help: use the named argument by name to avoid ambiguity
|
LL | println!("Hello {f}!", f = 0.02f32);
| +
warning: 5 warnings emitted