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Add some proc-macro attribute token handling tests #84016

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Apr 10, 2021
Merged

Add some proc-macro attribute token handling tests #84016

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4 changes: 3 additions & 1 deletion src/test/ui/proc-macro/auxiliary/nonterminal-recollect-attr.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -10,6 +10,7 @@ use proc_macro::{TokenStream, quote};
#[proc_macro_attribute]
pub fn first_attr(_: TokenStream, input: TokenStream) -> TokenStream {
let recollected: TokenStream = input.into_iter().collect();
println!("First recollected: {:#?}", recollected);
quote! {
#[second_attr]
$recollected
Expand All @@ -18,6 +19,7 @@ pub fn first_attr(_: TokenStream, input: TokenStream) -> TokenStream {

#[proc_macro_attribute]
pub fn second_attr(_: TokenStream, input: TokenStream) -> TokenStream {
let _recollected: TokenStream = input.into_iter().collect();
let recollected: TokenStream = input.into_iter().collect();
println!("Second recollected: {:#?}", recollected);
TokenStream::new()
}
39 changes: 39 additions & 0 deletions src/test/ui/proc-macro/cfg-eval-inner.rs
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@@ -0,0 +1,39 @@
// compile-flags: -Z span-debug
// aux-build:test-macros.rs
// check-pass

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

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

#[macro_use]
extern crate test_macros;

struct Foo<T>(T);

impl Foo<[u8; {
#![cfg_attr(not(FALSE), rustc_dummy(cursed_inner))]
#![allow(unused)]
struct Inner {
field: [u8; {
#![cfg_attr(not(FALSE), rustc_dummy(another_cursed_inner))]
1
}]
}

0
}]> {
#![cfg_eval]
#![print_attr]
#![cfg_attr(not(FALSE), rustc_dummy(evaluated_attr))]

fn bar() {
#[cfg(FALSE)] let a = 1;
}
}

fn main() {}
252 changes: 252 additions & 0 deletions src/test/ui/proc-macro/cfg-eval-inner.stdout
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Original file line number Diff line number Diff line change
@@ -0,0 +1,252 @@
PRINT-ATTR INPUT (DISPLAY): impl Foo <
[u8 ;
{
# ! [rustc_dummy(cursed_inner)] # ! [allow(unused)] struct Inner
{ field : [u8 ; { # ! [rustc_dummy(another_cursed_inner)] 1 }], } 0
}] > { # ! [rustc_dummy(evaluated_attr)] fn bar() { } }
PRINT-ATTR INPUT (DEBUG): TokenStream [
Ident {
ident: "impl",
span: $DIR/cfg-eval-inner.rs:18:1: 37:2 (#0),
},
Ident {
ident: "Foo",
span: $DIR/cfg-eval-inner.rs:18:1: 37:2 (#0),
},
Punct {
ch: '<',
spacing: Alone,
span: $DIR/cfg-eval-inner.rs:18:1: 37:2 (#0),
},
Group {
delimiter: Bracket,
stream: TokenStream [
Ident {
ident: "u8",
span: $DIR/cfg-eval-inner.rs:18:1: 37:2 (#0),
},
Punct {
ch: ';',
spacing: Alone,
span: $DIR/cfg-eval-inner.rs:18:1: 37:2 (#0),
},
Group {
delimiter: Brace,
stream: TokenStream [
Punct {
ch: '#',
spacing: Joint,
span: $DIR/cfg-eval-inner.rs:18:1: 37:2 (#0),
},
Punct {
ch: '!',
spacing: Alone,
span: $DIR/cfg-eval-inner.rs:18:1: 37:2 (#0),
},
Group {
delimiter: Bracket,
stream: TokenStream [
Ident {
ident: "rustc_dummy",
span: $DIR/cfg-eval-inner.rs:18:1: 37:2 (#0),
},
Group {
delimiter: Parenthesis,
stream: TokenStream [
Ident {
ident: "cursed_inner",
span: $DIR/cfg-eval-inner.rs:18:1: 37:2 (#0),
},
],
span: $DIR/cfg-eval-inner.rs:18:1: 37:2 (#0),
},
],
span: $DIR/cfg-eval-inner.rs:18:1: 37:2 (#0),
},
Punct {
ch: '#',
spacing: Joint,
span: $DIR/cfg-eval-inner.rs:18:1: 37:2 (#0),
},
Punct {
ch: '!',
spacing: Alone,
span: $DIR/cfg-eval-inner.rs:18:1: 37:2 (#0),
},
Group {
delimiter: Bracket,
stream: TokenStream [
Ident {
ident: "allow",
span: $DIR/cfg-eval-inner.rs:18:1: 37:2 (#0),
},
Group {
delimiter: Parenthesis,
stream: TokenStream [
Ident {
ident: "unused",
span: $DIR/cfg-eval-inner.rs:18:1: 37:2 (#0),
},
],
span: $DIR/cfg-eval-inner.rs:18:1: 37:2 (#0),
},
],
span: $DIR/cfg-eval-inner.rs:18:1: 37:2 (#0),
},
Ident {
ident: "struct",
span: $DIR/cfg-eval-inner.rs:18:1: 37:2 (#0),
},
Ident {
ident: "Inner",
span: $DIR/cfg-eval-inner.rs:18:1: 37:2 (#0),
},
Group {
delimiter: Brace,
stream: TokenStream [
Ident {
ident: "field",
span: $DIR/cfg-eval-inner.rs:18:1: 37:2 (#0),
},
Punct {
ch: ':',
spacing: Alone,
span: $DIR/cfg-eval-inner.rs:18:1: 37:2 (#0),
},
Group {
delimiter: Bracket,
stream: TokenStream [
Ident {
ident: "u8",
span: $DIR/cfg-eval-inner.rs:18:1: 37:2 (#0),
},
Punct {
ch: ';',
spacing: Alone,
span: $DIR/cfg-eval-inner.rs:18:1: 37:2 (#0),
},
Group {
delimiter: Brace,
stream: TokenStream [
Punct {
ch: '#',
spacing: Joint,
span: $DIR/cfg-eval-inner.rs:18:1: 37:2 (#0),
},
Punct {
ch: '!',
spacing: Alone,
span: $DIR/cfg-eval-inner.rs:18:1: 37:2 (#0),
},
Group {
delimiter: Bracket,
stream: TokenStream [
Ident {
ident: "rustc_dummy",
span: $DIR/cfg-eval-inner.rs:18:1: 37:2 (#0),
},
Group {
delimiter: Parenthesis,
stream: TokenStream [
Ident {
ident: "another_cursed_inner",
span: $DIR/cfg-eval-inner.rs:18:1: 37:2 (#0),
},
],
span: $DIR/cfg-eval-inner.rs:18:1: 37:2 (#0),
},
],
span: $DIR/cfg-eval-inner.rs:18:1: 37:2 (#0),
},
Literal {
kind: Integer,
symbol: "1",
suffix: None,
span: $DIR/cfg-eval-inner.rs:18:1: 37:2 (#0),
},
],
span: $DIR/cfg-eval-inner.rs:18:1: 37:2 (#0),
},
],
span: $DIR/cfg-eval-inner.rs:18:1: 37:2 (#0),
},
Punct {
ch: ',',
spacing: Alone,
span: $DIR/cfg-eval-inner.rs:18:1: 37:2 (#0),
},
],
span: $DIR/cfg-eval-inner.rs:18:1: 37:2 (#0),
},
Literal {
kind: Integer,
symbol: "0",
suffix: None,
span: $DIR/cfg-eval-inner.rs:18:1: 37:2 (#0),
},
],
span: $DIR/cfg-eval-inner.rs:18:1: 37:2 (#0),
},
],
span: $DIR/cfg-eval-inner.rs:18:1: 37:2 (#0),
},
Punct {
ch: '>',
spacing: Alone,
span: $DIR/cfg-eval-inner.rs:18:1: 37:2 (#0),
},
Group {
delimiter: Brace,
stream: TokenStream [
Punct {
ch: '#',
spacing: Joint,
span: $DIR/cfg-eval-inner.rs:18:1: 37:2 (#0),
},
Punct {
ch: '!',
spacing: Alone,
span: $DIR/cfg-eval-inner.rs:18:1: 37:2 (#0),
},
Group {
delimiter: Bracket,
stream: TokenStream [
Ident {
ident: "rustc_dummy",
span: $DIR/cfg-eval-inner.rs:18:1: 37:2 (#0),
},
Group {
delimiter: Parenthesis,
stream: TokenStream [
Ident {
ident: "evaluated_attr",
span: $DIR/cfg-eval-inner.rs:18:1: 37:2 (#0),
},
],
span: $DIR/cfg-eval-inner.rs:18:1: 37:2 (#0),
},
],
span: $DIR/cfg-eval-inner.rs:18:1: 37:2 (#0),
},
Ident {
ident: "fn",
span: $DIR/cfg-eval-inner.rs:18:1: 37:2 (#0),
},
Ident {
ident: "bar",
span: $DIR/cfg-eval-inner.rs:18:1: 37:2 (#0),
},
Group {
delimiter: Parenthesis,
stream: TokenStream [],
span: $DIR/cfg-eval-inner.rs:18:1: 37:2 (#0),
},
Group {
delimiter: Brace,
stream: TokenStream [],
span: $DIR/cfg-eval-inner.rs:18:1: 37:2 (#0),
},
],
span: $DIR/cfg-eval-inner.rs:18:1: 37:2 (#0),
},
]
9 changes: 7 additions & 2 deletions src/test/ui/proc-macro/cfg-eval.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -5,7 +5,7 @@
#![feature(cfg_eval)]
#![feature(proc_macro_hygiene)]
#![feature(stmt_expr_attributes)]

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

Expand All @@ -28,5 +28,10 @@ struct S1 {
struct S2 {}

fn main() {
let _ = #[cfg_eval] #[print_attr](#[cfg(FALSE)] 0, #[cfg(all(/*true*/))] 1);
// Subtle - we need a trailing comma after the '1' - otherwise, `#[cfg_eval]` will
// turn this into `(#[cfg(all())] 1)`, which is a parenthesized expression, not a tuple
// expression. `#[cfg]` is not supported inside parenthesized expressions, so this will
// produce an error when attribute collection runs.
let _ = #[cfg_eval] #[print_attr] #[cfg_attr(not(FALSE), rustc_dummy)]
(#[cfg(FALSE)] 0, #[cfg(all(/*true*/))] 1,);
}
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