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Rollup merge of #92417 - dtolnay:printimpl, r=jackh726

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Fix spacing and ordering of words in pretty printed Impl

Follow-up to #92238 fixing one of the FIXMEs.

```rust
macro_rules! repro {
    ($item:item) => {
        stringify!($item)
    };
}

fn main() {
    println!("{}", repro!(impl<T> Struct<T> {}));
    println!("{}", repro!(impl<T> const Trait for T {}));
}
```

Before:&ensp;`impl <T> Struct<T> {}`
After:&ensp;`impl<T> Struct<T> {}`

Before:&ensp;`impl const <T> Trait for T {}` 😿
After:&ensp;`impl<T> const Trait for T {}`
This commit is contained in:
Matthias Krüger 2022-01-06 23:15:16 +01:00 • committed by GitHub
commit 1a8f69826c
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2 changed files with 13 additions and 4 deletions
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9
compiler/rustc_ast_pretty/src/pprust/state.rs
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@ -1287,14 +1287,17 @@ impl<'a> State<'a> {
self.print_visibility(&item.vis);
self.print_defaultness(defaultness);
self.print_unsafety(unsafety);
self.word_nbsp("impl");
self.print_constness(constness);
self.word("impl");
if !generics.params.is_empty() {
if generics.params.is_empty() {
self.nbsp();
} else {
self.print_generic_params(&generics.params);
self.space();
}
self.print_constness(constness);
if let ast::ImplPolarity::Negative(_) = polarity {
self.word("!");
}