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Rollup merge of #106805 - madsravn:master, r=compiler-errors

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Suggest `{var:?}` when finding `{?:var}` in inline format strings

Link to issue: https://github.com/rust-lang/rust/issues/106572

This is my first PR to this project, so hopefully I can get some good pointers with me from the first PR.

Currently my idea was to test out whether or not this is the correct solution to this issue and then hopefully expand upon the idea to not only work for Debug formatting but for all of  them. If this is a valid solution, I will create a new issue to give a better error message to a broader range of wrong-order formatting.
This commit is contained in:
Matthias Krüger 2023-02-03 06:30:23 +01:00 • committed by GitHub
commit 2fdb3559c4
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3 changed files with 97 additions and 1 deletions
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29
compiler/rustc_parse_format/src/lib.rs
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@ -273,7 +273,13 @@ impl<'a> Iterator for Parser<'a> {
);
}
} else {
self.suggest_positional_arg_instead_of_captured_arg(arg);
if let Some(&(_, maybe)) = self.cur.peek() {
if maybe == '?' {
self.suggest_format();
} else {
self.suggest_positional_arg_instead_of_captured_arg(arg);
}
}
}
Some(NextArgument(Box::new(arg)))
}
@ -832,6 +838,27 @@ impl<'a> Parser<'a> {
if found { Some(cur) } else { None }
}
fn suggest_format(&mut self) {
if let (Some(pos), Some(_)) = (self.consume_pos('?'), self.consume_pos(':')) {
let word = self.word();
let _end = self.current_pos();
let pos = self.to_span_index(pos);
self.errors.insert(
0,
ParseError {
description: "expected format parameter to occur after `:`".to_owned(),
note: Some(
format!("`?` comes after `:`, try `{}:{}` instead", word, "?").to_owned(),
),
label: "expected `?` to occur after `:`".to_owned(),
span: pos.to(pos),
secondary_label: None,
should_be_replaced_with_positional_argument: false,
},
);
}
}
fn suggest_positional_arg_instead_of_captured_arg(&mut self, arg: Argument<'a>) {
if let Some(end) = self.consume_pos('.') {
let byte_pos = self.to_span_index(end);