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Merged
rust-bors merged 1 commit into from
Jul 20, 2026
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Merged

Add regression test for nested replacement ranges in collect_tokens #159529

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40 changes: 40 additions & 0 deletions tests/ui/proc-macro/macro-rules-derive-cfg-nested.rs
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Original file line number Diff line number Diff line change
@@ -0,0 +1,40 @@
//@ check-pass
//@ compile-flags: -Z span-debug --error-format human
//@ proc-macro: test-macros.rs

// Regression test for #132727. `collect_tokens` must support nested
// replacement ranges: expanding the inner `cfg_attr` on `$expr` produces a
// replacement range nested inside the one for the `let` statement, which is
// itself nested inside the one for `Foo`'s anonymous constant. This case was
// originally covered by `macro-rules-derive-cfg.rs`, but #129346 (which
// removed support for nested replacement ranges) simplified the nesting away
// from that test, and the revert in #132587 didn't restore it.

#![feature(rustc_attrs)]
#![feature(stmt_expr_attributes)]

#![no_std] // Don't load unnecessary hygiene information from std
extern crate std;

#[macro_use]
extern crate test_macros;

macro_rules! produce_it {
($expr:expr) => {
#[derive(Print)]
struct Foo {
val: [bool; {
let a = #[cfg_attr(not(FALSE), rustc_dummy(first))] $expr;
0
}]
}
}
}

produce_it!(#[cfg_attr(not(FALSE), rustc_dummy(second))] {
#![cfg_attr(not(FALSE), rustc_dummy(third))]
#[cfg_attr(not(FALSE), rustc_dummy(fourth))]
30
});

fn main() {}
213 changes: 213 additions & 0 deletions tests/ui/proc-macro/macro-rules-derive-cfg-nested.stdout
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Original file line number Diff line number Diff line change
@@ -0,0 +1,213 @@
PRINT-DERIVE INPUT (DISPLAY): struct Foo
{
val :
[bool;
{
let a = #[rustc_dummy(first)]
#[rustc_dummy(second)]
{ #![rustc_dummy(third)] #[rustc_dummy(fourth)] 30 }; 0
}]
}
PRINT-DERIVE DEEP-RE-COLLECTED (DISPLAY): struct Foo
{
val :
[bool;
{
let a = #[rustc_dummy(first)]
#[rustc_dummy(second)]
{ #! [rustc_dummy(third)] #[rustc_dummy(fourth)] 30 }; 0
}]
}
PRINT-DERIVE INPUT (DEBUG): TokenStream [
Ident {
ident: "struct",
span: $DIR/macro-rules-derive-cfg-nested.rs:25:9: 25:15 (#3),
},
Ident {
ident: "Foo",
span: $DIR/macro-rules-derive-cfg-nested.rs:25:16: 25:19 (#3),
},
Group {
delimiter: Brace,
stream: TokenStream [
Ident {
ident: "val",
span: $DIR/macro-rules-derive-cfg-nested.rs:26:13: 26:16 (#3),
},
Punct {
ch: ':',
spacing: Alone,
span: $DIR/macro-rules-derive-cfg-nested.rs:26:16: 26:17 (#3),
},
Group {
delimiter: Bracket,
stream: TokenStream [
Ident {
ident: "bool",
span: $DIR/macro-rules-derive-cfg-nested.rs:26:19: 26:23 (#3),
},
Punct {
ch: ';',
spacing: Alone,
span: $DIR/macro-rules-derive-cfg-nested.rs:26:23: 26:24 (#3),
},
Group {
delimiter: Brace,
stream: TokenStream [
Ident {
ident: "let",
span: $DIR/macro-rules-derive-cfg-nested.rs:27:17: 27:20 (#3),
},
Ident {
ident: "a",
span: $DIR/macro-rules-derive-cfg-nested.rs:27:21: 27:22 (#3),
},
Punct {
ch: '=',
spacing: Alone,
span: $DIR/macro-rules-derive-cfg-nested.rs:27:23: 27:24 (#3),
},
Punct {
ch: '#',
spacing: Alone,
span: $DIR/macro-rules-derive-cfg-nested.rs:27:25: 27:26 (#3),
},
Group {
delimiter: Bracket,
stream: TokenStream [
Ident {
ident: "rustc_dummy",
span: $DIR/macro-rules-derive-cfg-nested.rs:27:48: 27:59 (#3),
},
Group {
delimiter: Parenthesis,
stream: TokenStream [
Ident {
ident: "first",
span: $DIR/macro-rules-derive-cfg-nested.rs:27:60: 27:65 (#3),
},
],
span: $DIR/macro-rules-derive-cfg-nested.rs:27:59: 27:66 (#3),
},
],
span: $DIR/macro-rules-derive-cfg-nested.rs:27:26: 27:68 (#3),
},
Group {
delimiter: None,
stream: TokenStream [
Punct {
ch: '#',
spacing: Alone,
span: $DIR/macro-rules-derive-cfg-nested.rs:34:13: 34:14 (#0),
},
Group {
delimiter: Bracket,
stream: TokenStream [
Ident {
ident: "rustc_dummy",
span: $DIR/macro-rules-derive-cfg-nested.rs:34:36: 34:47 (#0),
},
Group {
delimiter: Parenthesis,
stream: TokenStream [
Ident {
ident: "second",
span: $DIR/macro-rules-derive-cfg-nested.rs:34:48: 34:54 (#0),
},
],
span: $DIR/macro-rules-derive-cfg-nested.rs:34:47: 34:55 (#0),
},
],
span: $DIR/macro-rules-derive-cfg-nested.rs:34:14: 34:57 (#0),
},
Group {
delimiter: Brace,
stream: TokenStream [
Punct {
ch: '#',
spacing: Joint,
span: $DIR/macro-rules-derive-cfg-nested.rs:35:5: 35:6 (#0),
},
Punct {
ch: '!',
spacing: Alone,
span: $DIR/macro-rules-derive-cfg-nested.rs:35:6: 35:7 (#0),
},
Group {
delimiter: Bracket,
stream: TokenStream [
Ident {
ident: "rustc_dummy",
span: $DIR/macro-rules-derive-cfg-nested.rs:35:29: 35:40 (#0),
},
Group {
delimiter: Parenthesis,
stream: TokenStream [
Ident {
ident: "third",
span: $DIR/macro-rules-derive-cfg-nested.rs:35:41: 35:46 (#0),
},
],
span: $DIR/macro-rules-derive-cfg-nested.rs:35:40: 35:47 (#0),
},
],
span: $DIR/macro-rules-derive-cfg-nested.rs:35:7: 35:49 (#0),
},
Punct {
ch: '#',
spacing: Alone,
span: $DIR/macro-rules-derive-cfg-nested.rs:36:5: 36:6 (#0),
},
Group {
delimiter: Bracket,
stream: TokenStream [
Ident {
ident: "rustc_dummy",
span: $DIR/macro-rules-derive-cfg-nested.rs:36:28: 36:39 (#0),
},
Group {
delimiter: Parenthesis,
stream: TokenStream [
Ident {
ident: "fourth",
span: $DIR/macro-rules-derive-cfg-nested.rs:36:40: 36:46 (#0),
},
],
span: $DIR/macro-rules-derive-cfg-nested.rs:36:39: 36:47 (#0),
},
],
span: $DIR/macro-rules-derive-cfg-nested.rs:36:6: 36:49 (#0),
},
Literal {
kind: Integer,
symbol: "30",
suffix: None,
span: $DIR/macro-rules-derive-cfg-nested.rs:37:5: 37:7 (#0),
},
],
span: $DIR/macro-rules-derive-cfg-nested.rs:34:58: 38:2 (#0),
},
],
span: $DIR/macro-rules-derive-cfg-nested.rs:27:69: 27:74 (#3),
},
Punct {
ch: ';',
spacing: Alone,
span: $DIR/macro-rules-derive-cfg-nested.rs:27:74: 27:75 (#3),
},
Literal {
kind: Integer,
symbol: "0",
suffix: None,
span: $DIR/macro-rules-derive-cfg-nested.rs:28:17: 28:18 (#3),
},
],
span: $DIR/macro-rules-derive-cfg-nested.rs:26:25: 29:14 (#3),
},
],
span: $DIR/macro-rules-derive-cfg-nested.rs:26:18: 29:15 (#3),
},
],
span: $DIR/macro-rules-derive-cfg-nested.rs:25:20: 30:10 (#3),
},
]
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