bjoernager/rust
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Rollup merge of #91907 - lcnr:const-arg-infer, r=BoxyUwU

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Allow `_` as the length of array types and repeat expressions

r? `@BoxyUwU` cc `@varkor`
This commit is contained in:
Matthias Krüger 2022-01-04 21:23:06 +01:00 • committed by GitHub
commit ac7a867715
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28 changed files with 268 additions and 85 deletions
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13
compiler/rustc_hir_pretty/src/lib.rs
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@ -358,7 +358,7 @@ impl<'a> State<'a> {
self.word("[");
self.print_type(&ty);
self.word("; ");
self.print_anon_const(length);
self.print_array_length(length);
self.word("]");
}
hir::TyKind::Typeof(ref e) => {
@ -1065,6 +1065,13 @@ impl<'a> State<'a> {
self.print_else(elseopt)
}
pub fn print_array_length(&mut self, len: &hir::ArrayLen) {
match len {
hir::ArrayLen::Infer(_, _) => self.word("_"),
hir::ArrayLen::Body(ct) => self.print_anon_const(ct),
}
}
pub fn print_anon_const(&mut self, constant: &hir::AnonConst) {
self.ann.nested(self, Nested::Body(constant.body))
}
@ -1140,12 +1147,12 @@ impl<'a> State<'a> {
self.end()
}
fn print_expr_repeat(&mut self, element: &hir::Expr<'_>, count: &hir::AnonConst) {
fn print_expr_repeat(&mut self, element: &hir::Expr<'_>, count: &hir::ArrayLen) {
self.ibox(INDENT_UNIT);
self.word("[");
self.print_expr(element);
self.word_space(";");
self.print_anon_const(count);
self.print_array_length(count);
self.word("]");
self.end()
}