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

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Merged
merged 1 commit into from
Jun 24, 2022
Merged

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

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65 changes: 33 additions & 32 deletions compiler/rustc_typeck/src/astconv/mod.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -2111,14 +2111,24 @@ impl<'o, 'tcx> dyn AstConv<'tcx> + 'o {
extend: impl Fn(&mut DiagnosticBuilder<'tcx, ErrorGuaranteed>),
) -> bool {
let args = segments.clone().flat_map(|segment| segment.args().args);
let types_and_spans: Vec<_> = segments
.clone()
.flat_map(|segment| {
segment.res.and_then(|res| {
if segment.args().args.is_empty() {
None
} else {
Some((

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
.clone()
.flat_map(|segment| {
segment.res.and_then(|res| {
if segment.args().args.is_empty() {
None
} else {
Some((
match res {
Res::PrimTy(ty) => format!("{} `{}`", res.descr(), ty.name()),
Res::Def(_, def_id)
Expand All @@ -2130,32 +2140,23 @@ impl<'o, 'tcx> dyn AstConv<'tcx> + 'o {
},
segment.ident.span,
))
}
}
})
})
})
.collect();
let this_type = match &types_and_spans[..] {
[.., _, (last, _)] => format!(
"{} and {last}",
types_and_spans[..types_and_spans.len() - 1]
.iter()
.map(|(x, _)| x.as_str())
.intersperse(&", ")
.collect::<String>()
),
[(only, _)] => only.to_string(),
[] => "this type".to_string(),
};
.collect();
let this_type = match &types_and_spans[..] {
[.., _, (last, _)] => format!(
"{} and {last}",
types_and_spans[..types_and_spans.len() - 1]
.iter()
.map(|(x, _)| x.as_str())
.intersperse(&", ")
.collect::<String>()
),
[(only, _)] => only.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 mut kinds = Vec::with_capacity(4);
Expand Down