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Special treatment empty tuple when suggest adding a string literal in format macro.

Browse Source 
For example:
```rust
let s = "123";
println!({}, "sss", s);
```
Suggest:
`println!("{:?} {} {}", {}, "sss", s);`

fixes #130170
This commit is contained in:
surechen 2024-10-09 11:14:59 +08:00
parent 1b5aa96d60
commit ceced5322c
4 changed files with 90 additions and 4 deletions
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22
compiler/rustc_builtin_macros/src/format.rs
View File

@ -195,12 +195,26 @@ fn make_format_args(
Applicability::MaybeIncorrect,
);
} else {
let sugg_fmt = match args.explicit_args().len() {
0 => "{}".to_string(),
count => {
format!("{}{{}}", "{} ".repeat(count))
// `{}` or `()`
let should_suggest = |kind: &ExprKind| -> bool {
match kind {
ExprKind::Block(b, None) if b.stmts.is_empty() => true,
ExprKind::Tup(v) if v.is_empty() => true,
_ => false,
}
};
let mut sugg_fmt = String::new();
for kind in std::iter::once(&efmt.kind)
.chain(args.explicit_args().into_iter().map(|a| &a.expr.kind))
{
sugg_fmt.push_str(if should_suggest(kind) {
"{:?} "
} else {
"{} "
});
}
sugg_fmt = sugg_fmt.trim_end().to_string();
err.span_suggestion(
unexpanded_fmt_span.shrink_to_lo(),
"you might be missing a string literal to format with",

13
tests/ui/macros/format-empty-block-unit-tuple-suggestion-130170.fixed Normal file
View File

@ -0,0 +1,13 @@
//@ run-rustfix
fn main() {
let s = "123";
println!("{:?} {} {}", {}, "sss", s);
//~^ ERROR format argument must be a string literal
println!("{:?}", {});
//~^ ERROR format argument must be a string literal
println!("{} {} {} {:?}", s, "sss", s, {});
//~^ ERROR format argument must be a string literal
println!("{:?} {} {:?}", (), s, {});
//~^ ERROR format argument must be a string literal
}

13
tests/ui/macros/format-empty-block-unit-tuple-suggestion-130170.rs Normal file
View File

@ -0,0 +1,13 @@
//@ run-rustfix
fn main() {
let s = "123";
println!({}, "sss", s);
//~^ ERROR format argument must be a string literal
println!({});
//~^ ERROR format argument must be a string literal
println!(s, "sss", s, {});
//~^ ERROR format argument must be a string literal
println!((), s, {});
//~^ ERROR format argument must be a string literal
}

46
tests/ui/macros/format-empty-block-unit-tuple-suggestion-130170.stderr Normal file
View File

@ -0,0 +1,46 @@
error: format argument must be a string literal
--> $DIR/format-empty-block-unit-tuple-suggestion-130170.rs:5:14
|
LL | println!({}, "sss", s);
| ^^
|
help: you might be missing a string literal to format with
|
LL | println!("{:?} {} {}", {}, "sss", s);
| +++++++++++++
error: format argument must be a string literal
--> $DIR/format-empty-block-unit-tuple-suggestion-130170.rs:7:14
|
LL | println!({});
| ^^
|
help: you might be missing a string literal to format with
|
LL | println!("{:?}", {});
| +++++++
error: format argument must be a string literal
--> $DIR/format-empty-block-unit-tuple-suggestion-130170.rs:9:14
|
LL | println!(s, "sss", s, {});
| ^
|
help: you might be missing a string literal to format with
|
LL | println!("{} {} {} {:?}", s, "sss", s, {});
| ++++++++++++++++
error: format argument must be a string literal
--> $DIR/format-empty-block-unit-tuple-suggestion-130170.rs:11:14
|
LL | println!((), s, {});
| ^^
|
help: you might be missing a string literal to format with
|
LL | println!("{:?} {} {:?}", (), s, {});
| +++++++++++++++
error: aborting due to 4 previous errors