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tests: Add regression test for derive token invalidation (#81099) #137544

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Feb 26, 2025
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tests: Add regression test for derive token invalidation (#81099) #137544

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23 changes: 23 additions & 0 deletions tests/ui/proc-macro/derive-cfg-nested-tokens.rs
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Original file line number Diff line number Diff line change
@@ -0,0 +1,23 @@
// A regression test for issue #81099.

//@ check-pass
//@ proc-macro:test-macros.rs

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

#[macro_use]
extern crate test_macros;

#[derive(Clone, Copy)]
struct S {
// `print_args` runs twice
// - on eagerly configured `S` (from `impl Copy`), only 11 should be printed
// - on non-configured `S` (from `struct S`), both 10 and 11 should be printed
field: [u8; #[print_attr] {
#[cfg(FALSE)] { 10 }
#[cfg(not(FALSE))] { 11 }
}],
}

fn main() {}
149 changes: 149 additions & 0 deletions tests/ui/proc-macro/derive-cfg-nested-tokens.stdout
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Original file line number Diff line number Diff line change
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PRINT-ATTR INPUT (DISPLAY): { #[cfg(not(FALSE))] { 11 } }
PRINT-ATTR INPUT (DEBUG): TokenStream [
Group {
delimiter: Brace,
stream: TokenStream [
Punct {
ch: '#',
spacing: Alone,
span: #0 bytes(491..492),
},
Group {
delimiter: Bracket,
stream: TokenStream [
Ident {
ident: "cfg",
span: #0 bytes(493..496),
},
Group {
delimiter: Parenthesis,
stream: TokenStream [
Ident {
ident: "not",
span: #0 bytes(497..500),
},
Group {
delimiter: Parenthesis,
stream: TokenStream [
Ident {
ident: "FALSE",
span: #0 bytes(501..506),
},
],
span: #0 bytes(500..507),
},
],
span: #0 bytes(496..508),
},
],
span: #0 bytes(492..509),
},
Group {
delimiter: Brace,
stream: TokenStream [
Literal {
kind: Integer,
symbol: "11",
suffix: None,
span: #0 bytes(513..515),
},
],
span: #0 bytes(511..517),
},
],
span: #0 bytes(452..523),
},
]
PRINT-ATTR INPUT (DISPLAY): { #[cfg(FALSE)] { 10 } #[cfg(not(FALSE))] { 11 } }
PRINT-ATTR INPUT (DEBUG): TokenStream [
Group {
delimiter: Brace,
stream: TokenStream [
Punct {
ch: '#',
spacing: Alone,
span: #0 bytes(462..463),
},
Group {
delimiter: Bracket,
stream: TokenStream [
Ident {
ident: "cfg",
span: #0 bytes(464..467),
},
Group {
delimiter: Parenthesis,
stream: TokenStream [
Ident {
ident: "FALSE",
span: #0 bytes(468..473),
},
],
span: #0 bytes(467..474),
},
],
span: #0 bytes(463..475),
},
Group {
delimiter: Brace,
stream: TokenStream [
Literal {
kind: Integer,
symbol: "10",
suffix: None,
span: #0 bytes(478..480),
},
],
span: #0 bytes(476..482),
},
Punct {
ch: '#',
spacing: Alone,
span: #0 bytes(491..492),
},
Group {
delimiter: Bracket,
stream: TokenStream [
Ident {
ident: "cfg",
span: #0 bytes(493..496),
},
Group {
delimiter: Parenthesis,
stream: TokenStream [
Ident {
ident: "not",
span: #0 bytes(497..500),
},
Group {
delimiter: Parenthesis,
stream: TokenStream [
Ident {
ident: "FALSE",
span: #0 bytes(501..506),
},
],
span: #0 bytes(500..507),
},
],
span: #0 bytes(496..508),
},
],
span: #0 bytes(492..509),
},
Group {
delimiter: Brace,
stream: TokenStream [
Literal {
kind: Integer,
symbol: "11",
suffix: None,
span: #0 bytes(513..515),
},
],
span: #0 bytes(511..517),
},
],
span: #0 bytes(452..523),
},
]
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