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prohibit_generics: don't alloc error string if no error emitted #98305

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merged 1 commit into from
Jun 24, 2022
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prohibit_generics: don't alloc error string if no error emitted #98305

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19 changes: 10 additions & 9 deletions compiler/rustc_typeck/src/astconv/mod.rs
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Original file line number Original file line Diff line number Diff line change
Expand Up @@ -2111,6 +2111,16 @@ impl<'o, 'tcx> dyn AstConv<'tcx> + 'o {
extend: impl Fn(&mut DiagnosticBuilder<'tcx, ErrorGuaranteed>), extend: impl Fn(&mut DiagnosticBuilder<'tcx, ErrorGuaranteed>),
) -> bool { ) -> bool {
let args = segments.clone().flat_map(|segment| segment.args().args); let args = segments.clone().flat_map(|segment| segment.args().args);

let (lt, ty, ct, inf) =
args.clone().fold((false, false, false, false), |(lt, ty, ct, inf), arg| match arg {
hir::GenericArg::Lifetime(_) => (true, ty, ct, inf),
hir::GenericArg::Type(_) => (lt, true, ct, inf),
hir::GenericArg::Const(_) => (lt, ty, true, inf),
hir::GenericArg::Infer(_) => (lt, ty, ct, true),
});
let mut emitted = false;
if lt || ty || ct || inf {
let types_and_spans: Vec<_> = segments let types_and_spans: Vec<_> = segments
.clone() .clone()
.flat_map(|segment| { .flat_map(|segment| {
Expand Down Expand Up @@ -2147,15 +2157,6 @@ impl<'o, 'tcx> dyn AstConv<'tcx> + 'o {
[] => "this type".to_string(), [] => "this type".to_string(),
}; };


let (lt, ty, ct, inf) =
args.clone().fold((false, false, false, false), |(lt, ty, ct, inf), arg| match arg {
hir::GenericArg::Lifetime(_) => (true, ty, ct, inf),
hir::GenericArg::Type(_) => (lt, true, ct, inf),
hir::GenericArg::Const(_) => (lt, ty, true, inf),
hir::GenericArg::Infer(_) => (lt, ty, ct, true),
});
let mut emitted = false;
if lt || ty || ct || inf {
let arg_spans: Vec<Span> = args.map(|arg| arg.span()).collect(); let arg_spans: Vec<Span> = args.map(|arg| arg.span()).collect();


let mut kinds = Vec::with_capacity(4); let mut kinds = Vec::with_capacity(4);
Expand Down