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Rollup merge of #92487 - dtolnay:traitalias, r=matthewjasper

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Fix unclosed boxes in pretty printing of TraitAlias

This was causing trait aliases to not even render at all in stringified / pretty printed output.

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

fn main() {
    println!("{:?}", repro!(pub trait Trait<T> = Sized where T: 'a;));
}
```

Before:&ensp;`""`
After:&ensp;`"pub trait Trait<T> = Sized where T: 'a;"`

The fix is copied from how `head`/`end` for `ItemKind::Use`, `ItemKind::ExternCrate`, and `ItemKind::Mod` are all done in the pretty printer:

dd3ac41495/compiler/rustc_ast_pretty/src/pprust/state.rs (L1178-L1184)
This commit is contained in:
Matthias Krüger 2022-01-16 16:58:10 +01:00 • committed by GitHub
commit 9527533408
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3 changed files with 7 additions and 7 deletions
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6
compiler/rustc_hir_pretty/src/lib.rs
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@ -705,9 +705,7 @@ impl<'a> State<'a> {
self.bclose(item.span);
}
hir::ItemKind::TraitAlias(ref generics, ref bounds) => {
self.head("");
self.print_visibility(&item.vis);
self.word_nbsp("trait");
self.head(visibility_qualified(&item.vis, "trait"));
self.print_ident(item.ident);
self.print_generic_params(&generics.params);
let mut real_bounds = Vec::with_capacity(bounds.len());
@ -725,6 +723,8 @@ impl<'a> State<'a> {
self.print_bounds("=", real_bounds);
self.print_where_clause(&generics.where_clause);
self.word(";");
self.end(); // end inner head-block
self.end(); // end outer head-block
}
}
self.ann.post(self, AnnNode::Item(item))