bjoernager/rust
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Change look from a macro to a function.

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Using `#[track_caller]` works if the assertion is moved outside of the
closure.
This commit is contained in:
Nicholas Nethercote 2024-07-13 11:15:40 +10:00
parent 336e89bd15
commit 69f6145ad8
1 changed files with 63 additions and 62 deletions
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125
compiler/rustc_parse/src/parser/tests.rs
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@ -1376,12 +1376,13 @@ fn ttdelim_span() {
});
}
// Uses a macro rather than a function so that failure messages mention the
// correct line in the test function.
macro_rules! look {
($p:ident, $dist:literal, $kind:expr) => {
$p.look_ahead($dist, |tok| assert_eq!($kind, tok.kind));
};
#[track_caller]
fn look(p: &Parser<'_>, dist: usize, kind: rustc_ast::token::TokenKind) {
// Do the `assert_eq` outside the closure so that `track_caller` works.
// (`#![feature(closure_track_caller)]` + `#[track_caller]` on the closure
// doesn't give the line number in the test below if the assertion fails.)
let tok = p.look_ahead(dist, |tok| tok.clone());
assert_eq!(kind, tok.kind);
}
#[test]
@ -1397,63 +1398,63 @@ fn look_ahead() {
let mut p = string_to_parser(&psess, "fn f(x: u32) { x } struct S;".to_string());
// Current position is the `fn`.
look!(p, 0, token::Ident(kw::Fn, raw_no));
look!(p, 1, token::Ident(sym_f, raw_no));
look!(p, 2, token::OpenDelim(Delimiter::Parenthesis));
look!(p, 3, token::Ident(sym_x, raw_no));
look!(p, 4, token::Colon);
look!(p, 5, token::Ident(sym::u32, raw_no));
look!(p, 6, token::CloseDelim(Delimiter::Parenthesis));
look!(p, 7, token::OpenDelim(Delimiter::Brace));
look!(p, 8, token::Ident(sym_x, raw_no));
look!(p, 9, token::CloseDelim(Delimiter::Brace));
look!(p, 10, token::Ident(kw::Struct, raw_no));
look!(p, 11, token::Ident(sym_S, raw_no));
look!(p, 12, token::Semi);
look(&p, 0, token::Ident(kw::Fn, raw_no));
look(&p, 1, token::Ident(sym_f, raw_no));
look(&p, 2, token::OpenDelim(Delimiter::Parenthesis));
look(&p, 3, token::Ident(sym_x, raw_no));
look(&p, 4, token::Colon);
look(&p, 5, token::Ident(sym::u32, raw_no));
look(&p, 6, token::CloseDelim(Delimiter::Parenthesis));
look(&p, 7, token::OpenDelim(Delimiter::Brace));
look(&p, 8, token::Ident(sym_x, raw_no));
look(&p, 9, token::CloseDelim(Delimiter::Brace));
look(&p, 10, token::Ident(kw::Struct, raw_no));
look(&p, 11, token::Ident(sym_S, raw_no));
look(&p, 12, token::Semi);
// Any lookahead past the end of the token stream returns `Eof`.
look!(p, 13, token::Eof);
look!(p, 14, token::Eof);
look!(p, 15, token::Eof);
look!(p, 100, token::Eof);
look(&p, 13, token::Eof);
look(&p, 14, token::Eof);
look(&p, 15, token::Eof);
look(&p, 100, token::Eof);
// Move forward to the first `x`.
for _ in 0..3 {
p.bump();
}
look!(p, 0, token::Ident(sym_x, raw_no));
look!(p, 1, token::Colon);
look!(p, 2, token::Ident(sym::u32, raw_no));
look!(p, 3, token::CloseDelim(Delimiter::Parenthesis));
look!(p, 4, token::OpenDelim(Delimiter::Brace));
look!(p, 5, token::Ident(sym_x, raw_no));
look!(p, 6, token::CloseDelim(Delimiter::Brace));
look!(p, 7, token::Ident(kw::Struct, raw_no));
look!(p, 8, token::Ident(sym_S, raw_no));
look!(p, 9, token::Semi);
look!(p, 10, token::Eof);
look!(p, 11, token::Eof);
look!(p, 100, token::Eof);
look(&p, 0, token::Ident(sym_x, raw_no));
look(&p, 1, token::Colon);
look(&p, 2, token::Ident(sym::u32, raw_no));
look(&p, 3, token::CloseDelim(Delimiter::Parenthesis));
look(&p, 4, token::OpenDelim(Delimiter::Brace));
look(&p, 5, token::Ident(sym_x, raw_no));
look(&p, 6, token::CloseDelim(Delimiter::Brace));
look(&p, 7, token::Ident(kw::Struct, raw_no));
look(&p, 8, token::Ident(sym_S, raw_no));
look(&p, 9, token::Semi);
look(&p, 10, token::Eof);
look(&p, 11, token::Eof);
look(&p, 100, token::Eof);
// Move forward to the `;`.
for _ in 0..9 {
p.bump();
}
look!(p, 0, token::Semi);
look(&p, 0, token::Semi);
// Any lookahead past the end of the token stream returns `Eof`.
look!(p, 1, token::Eof);
look!(p, 100, token::Eof);
look(&p, 1, token::Eof);
look(&p, 100, token::Eof);
// Move one past the `;`, i.e. past the end of the token stream.
p.bump();
look!(p, 0, token::Eof);
look!(p, 1, token::Eof);
look!(p, 100, token::Eof);
look(&p, 0, token::Eof);
look(&p, 1, token::Eof);
look(&p, 100, token::Eof);
// Bumping after Eof is idempotent.
p.bump();
look!(p, 0, token::Eof);
look!(p, 1, token::Eof);
look!(p, 100, token::Eof);
look(&p, 0, token::Eof);
look(&p, 1, token::Eof);
look(&p, 100, token::Eof);
});
}
@ -1476,24 +1477,24 @@ fn look_ahead_non_outermost_stream() {
for _ in 0..3 {
p.bump();
}
look!(p, 0, token::Ident(kw::Fn, raw_no));
look!(p, 1, token::Ident(sym_f, raw_no));
look!(p, 2, token::OpenDelim(Delimiter::Parenthesis));
look!(p, 3, token::Ident(sym_x, raw_no));
look!(p, 4, token::Colon);
look!(p, 5, token::Ident(sym::u32, raw_no));
look!(p, 6, token::CloseDelim(Delimiter::Parenthesis));
look!(p, 7, token::OpenDelim(Delimiter::Brace));
look!(p, 8, token::Ident(sym_x, raw_no));
look!(p, 9, token::CloseDelim(Delimiter::Brace));
look!(p, 10, token::Ident(kw::Struct, raw_no));
look!(p, 11, token::Ident(sym_S, raw_no));
look!(p, 12, token::Semi);
look!(p, 13, token::CloseDelim(Delimiter::Brace));
look(&p, 0, token::Ident(kw::Fn, raw_no));
look(&p, 1, token::Ident(sym_f, raw_no));
look(&p, 2, token::OpenDelim(Delimiter::Parenthesis));
look(&p, 3, token::Ident(sym_x, raw_no));
look(&p, 4, token::Colon);
look(&p, 5, token::Ident(sym::u32, raw_no));
look(&p, 6, token::CloseDelim(Delimiter::Parenthesis));
look(&p, 7, token::OpenDelim(Delimiter::Brace));
look(&p, 8, token::Ident(sym_x, raw_no));
look(&p, 9, token::CloseDelim(Delimiter::Brace));
look(&p, 10, token::Ident(kw::Struct, raw_no));
look(&p, 11, token::Ident(sym_S, raw_no));
look(&p, 12, token::Semi);
look(&p, 13, token::CloseDelim(Delimiter::Brace));
// Any lookahead past the end of the token stream returns `Eof`.
look!(p, 14, token::Eof);
look!(p, 15, token::Eof);
look!(p, 100, token::Eof);
look(&p, 14, token::Eof);
look(&p, 15, token::Eof);
look(&p, 100, token::Eof);
});
}