rust/tests/ui/proc-macro/nonterminal-token-hygiene.stdout

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PRINT-BANG INPUT (DISPLAY): struct S;
PRINT-BANG INPUT (DEBUG): TokenStream [
Group {
delimiter: None,
stream: TokenStream [
Ident {
ident: "struct",
span: $DIR/nonterminal-token-hygiene.rs:32:5: 32:11 (#4),
},
Ident {
ident: "S",
span: $DIR/nonterminal-token-hygiene.rs:32:12: 32:13 (#4),
},
Punct {
ch: ';',
spacing: Alone,
span: $DIR/nonterminal-token-hygiene.rs:32:13: 32:14 (#4),
},
],
span: $DIR/nonterminal-token-hygiene.rs:22:27: 22:32 (#5),
},
]
#![feature /* 0#0 */(prelude_import)]
#![no_std /* 0#0 */]
// Make sure that marks from declarative macros are applied to tokens in nonterminal.
//@ check-pass
//@ compile-flags: -Z span-debug -Z macro-backtrace -Z unpretty=expanded,hygiene
//@ compile-flags: -Z trim-diagnostic-paths=no
// ignore-tidy-linelength
//@ normalize-stdout-test "\d+#" -> "0#"
//@ normalize-stdout-test "expn\d{3,}" -> "expnNNN"
//@ normalize-stdout-test "extern crate compiler_builtins /\* \d+ \*/" -> "extern crate compiler_builtins /* NNN */"
//@ aux-build:test-macros.rs
#![feature /* 0#0 */(decl_macro)]
#![no_std /* 0#0 */]
#[prelude_import /* 0#1 */]
use ::core /* 0#1 */::prelude /* 0#1 */::rust_2015 /* 0#1 */::*;
#[macro_use /* 0#1 */]
extern crate core /* 0#2 */;
extern crate compiler_builtins /* NNN */ as _ /* 0#2 */;
// Don't load unnecessary hygiene information from std
extern crate std /* 0#0 */;
#[macro_use /* 0#0 */]
extern crate test_macros /* 0#0 */;
macro_rules! outer
/*
0#0
*/ {
Improve `print_tts` by changing `tokenstream::Spacing`. `tokenstream::Spacing` appears on all `TokenTree::Token` instances, both punct and non-punct. Its current usage: - `Joint` means "can join with the next token *and* that token is a punct". - `Alone` means "cannot join with the next token *or* can join with the next token but that token is not a punct". The fact that `Alone` is used for two different cases is awkward. This commit augments `tokenstream::Spacing` with a new variant `JointHidden`, resulting in: - `Joint` means "can join with the next token *and* that token is a punct". - `JointHidden` means "can join with the next token *and* that token is a not a punct". - `Alone` means "cannot join with the next token". This *drastically* improves the output of `print_tts`. For example, this: ``` stringify!(let a: Vec<u32> = vec![];) ``` currently produces this string: ``` let a : Vec < u32 > = vec! [] ; ``` With this PR, it now produces this string: ``` let a: Vec<u32> = vec![] ; ``` (The space after the `]` is because `TokenTree::Delimited` currently doesn't have spacing information. The subsequent commit fixes this.) The new `print_tts` doesn't replicate original code perfectly. E.g. multiple space characters will be condensed into a single space character. But it's much improved. `print_tts` still produces the old, uglier output for code produced by proc macros. Because we have to translate the generated code from `proc_macro::Spacing` to the more expressive `token::Spacing`, which results in too much `proc_macro::Along` usage and no `proc_macro::JointHidden` usage. So `space_between` still exists and is used by `print_tts` in conjunction with the `Spacing` field. This change will also help with the removal of `Token::Interpolated`. Currently interpolated tokens are pretty-printed nicely via AST pretty printing. `Token::Interpolated` removal will mean they get printed with `print_tts`. Without this change, that would result in much uglier output for code produced by decl macro expansions. With this change, AST pretty printing and `print_tts` produce similar results. The commit also tweaks the comments on `proc_macro::Spacing`. In particular, it refers to "compound tokens" rather than "multi-char operators" because lifetimes aren't operators.
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($item:item) =>
{
macro inner() { print_bang! { $item } } inner!();
};
}
struct S /* 0#0 */;
macro inner /* 0#3 */ { () => { print_bang! { struct S; } } }
struct S /* 0#4 */;
// OK, not a duplicate definition of `S`
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fn main /* 0#0 */() {}
/*
Expansions:
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crate0::{{expn0}}: parent: crate0::{{expn0}}, call_site_ctxt: #0, def_site_ctxt: #0, kind: Root
crate0::{{expn1}}: parent: crate0::{{expn0}}, call_site_ctxt: #0, def_site_ctxt: #0, kind: AstPass(StdImports)
crate0::{{expn2}}: parent: crate0::{{expn0}}, call_site_ctxt: #0, def_site_ctxt: #0, kind: Macro(Bang, "outer")
crate0::{{expn3}}: parent: crate0::{{expn2}}, call_site_ctxt: #3, def_site_ctxt: #3, kind: Macro(Bang, "inner")
crate0::{{expn4}}: parent: crate0::{{expn3}}, call_site_ctxt: #5, def_site_ctxt: #0, kind: Macro(Bang, "print_bang")
crate1::{{expnNNN}}: parent: crate0::{{expn0}}, call_site_ctxt: #0, def_site_ctxt: #0, kind: Macro(Attr, "diagnostic::on_unimplemented")
crate1::{{expnNNN}}: parent: crate0::{{expn0}}, call_site_ctxt: #0, def_site_ctxt: #0, kind: Macro(Attr, "diagnostic::on_unimplemented")
crate1::{{expnNNN}}: parent: crate0::{{expn0}}, call_site_ctxt: #0, def_site_ctxt: #0, kind: Macro(Attr, "diagnostic::on_unimplemented")
crate1::{{expnNNN}}: parent: crate0::{{expn0}}, call_site_ctxt: #0, def_site_ctxt: #0, kind: Macro(Attr, "derive")
crate1::{{expnNNN}}: parent: crate0::{{expn0}}, call_site_ctxt: #0, def_site_ctxt: #0, kind: Macro(Attr, "derive")
crate1::{{expnNNN}}: parent: crate0::{{expn0}}, call_site_ctxt: #0, def_site_ctxt: #0, kind: Macro(Bang, "include")
SyntaxContexts:
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#0: parent: #0, outer_mark: (crate0::{{expn0}}, Opaque)
#1: parent: #0, outer_mark: (crate0::{{expn1}}, Opaque)
#2: parent: #0, outer_mark: (crate0::{{expn1}}, Transparent)
#3: parent: #0, outer_mark: (crate0::{{expn2}}, SemiTransparent)
#4: parent: #0, outer_mark: (crate0::{{expn3}}, Opaque)
#5: parent: #3, outer_mark: (crate0::{{expn3}}, Opaque)
#6: parent: #0, outer_mark: (crate0::{{expn4}}, Opaque)
#7: parent: #5, outer_mark: (crate0::{{expn4}}, Transparent)
#8: parent: #4, outer_mark: (crate0::{{expn4}}, SemiTransparent)
*/