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Pattern types: Prohibit generic args on const params

This commit is contained in:
León Orell Valerian Liehr 2024-05-11 15:40:34 +02:00
parent 7c4ac0603e
commit 7faa879486
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GPG Key ID: D17A07215F68E713
6 changed files with 66 additions and 13 deletions
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6
compiler/rustc_hir_analysis/messages.ftl
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@ -371,9 +371,9 @@ hir_analysis_pass_to_variadic_function = can't pass `{$ty}` to variadic function
.suggestion = cast the value to `{$cast_ty}`
.help = cast the value to `{$cast_ty}`
hir_analysis_pattern_type_non_const_range = "range patterns must have constant range start and end"
hir_analysis_pattern_type_wild_pat = "wildcard patterns are not permitted for pattern types"
.label = "this type is the same as the inner type without a pattern"
hir_analysis_pattern_type_non_const_range = range patterns must have constant range start and end
hir_analysis_pattern_type_wild_pat = wildcard patterns are not permitted for pattern types
.label = this type is the same as the inner type without a pattern
hir_analysis_placeholder_not_allowed_item_signatures = the placeholder `_` is not allowed within types on item signatures for {$kind}
.label = not allowed in type signatures

10
compiler/rustc_hir_analysis/src/hir_ty_lowering/errors.rs
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@ -1388,7 +1388,7 @@ pub enum GenericsArgsErrExtend<'tcx> {
span: Span,
},
SelfTyParam(Span),
TyParam(DefId),
Param(DefId),
DefVariant,
None,
}
@ -1504,11 +1504,11 @@ fn generics_args_err_extend<'a>(
GenericsArgsErrExtend::DefVariant => {
err.note("enum variants can't have type parameters");
}
GenericsArgsErrExtend::TyParam(def_id) => {
if let Some(span) = tcx.def_ident_span(def_id) {
GenericsArgsErrExtend::Param(def_id) => {
let span = tcx.def_ident_span(def_id).unwrap();
let kind = tcx.def_descr(def_id);
let name = tcx.item_name(def_id);
err.span_note(span, format!("type parameter `{name}` defined here"));
}
err.span_note(span, format!("{kind} `{name}` defined here"));
}
GenericsArgsErrExtend::SelfTyParam(span) => {
err.span_suggestion_verbose(

11
compiler/rustc_hir_analysis/src/hir_ty_lowering/mod.rs
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@ -1756,7 +1756,7 @@ impl<'tcx> dyn HirTyLowerer<'tcx> + '_ {
assert_eq!(opt_self_ty, None);
let _ = self.prohibit_generic_args(
path.segments.iter(),
GenericsArgsErrExtend::TyParam(def_id),
GenericsArgsErrExtend::Param(def_id),
);
self.lower_ty_param(hir_id)
}
@ -2196,10 +2196,15 @@ impl<'tcx> dyn HirTyLowerer<'tcx> + '_ {
hir::ExprKind::Path(hir::QPath::Resolved(
_,
&hir::Path {
res: Res::Def(DefKind::ConstParam, def_id), ..
path @ &hir::Path {
res: Res::Def(DefKind::ConstParam, def_id),
..
},
)) => {
let _ = self.prohibit_generic_args(
path.segments.iter(),
GenericsArgsErrExtend::Param(def_id),
);
let ty = tcx
.type_of(def_id)
.no_bound_vars()

10
tests/ui/type/pattern_types/bad_const_generics_args_on_const_param.rs Normal file
View File

@ -0,0 +1,10 @@
#![feature(pattern_types, core_pattern_type)]
#![allow(internal_features)]
type Pat<const START: u32, const END: u32> =
std::pat::pattern_type!(u32 is START::<(), i32, 2>..=END::<_, Assoc = ()>);
//~^ ERROR type and const arguments are not allowed on const parameter `START`
//~| ERROR type arguments are not allowed on const parameter `END`
//~| ERROR associated type bindings are not allowed here
fn main() {}

38
tests/ui/type/pattern_types/bad_const_generics_args_on_const_param.stderr Normal file
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@ -0,0 +1,38 @@
error[E0109]: type and const arguments are not allowed on const parameter `START`
--> $DIR/bad_const_generics_args_on_const_param.rs:5:44
|
LL | std::pat::pattern_type!(u32 is START::<(), i32, 2>..=END::<_, Assoc = ()>);
| ----- ^^ ^^^ ^ type and const arguments not allowed
| |
| not allowed on const parameter `START`
|
note: const parameter `START` defined here
--> $DIR/bad_const_generics_args_on_const_param.rs:4:16
|
LL | type Pat<const START: u32, const END: u32> =
| ^^^^^
error[E0109]: type arguments are not allowed on const parameter `END`
--> $DIR/bad_const_generics_args_on_const_param.rs:5:64
|
LL | std::pat::pattern_type!(u32 is START::<(), i32, 2>..=END::<_, Assoc = ()>);
| --- ^ type argument not allowed
| |
| not allowed on const parameter `END`
|
note: const parameter `END` defined here
--> $DIR/bad_const_generics_args_on_const_param.rs:4:34
|
LL | type Pat<const START: u32, const END: u32> =
| ^^^
error[E0229]: associated type bindings are not allowed here
--> $DIR/bad_const_generics_args_on_const_param.rs:5:67
|
LL | std::pat::pattern_type!(u32 is START::<(), i32, 2>..=END::<_, Assoc = ()>);
| ^^^^^^^^^^ associated type not allowed here
error: aborting due to 3 previous errors
Some errors have detailed explanations: E0109, E0229.
For more information about an error, try `rustc --explain E0109`.

2
tests/ui/type/pattern_types/bad_pat.stderr
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@ -14,7 +14,7 @@ LL | type Positive2 = pattern_type!(i32 is 0..=);
|
= note: inclusive ranges must be bounded at the end (`..=b` or `a..=b`)
error: "wildcard patterns are not permitted for pattern types"
error: wildcard patterns are not permitted for pattern types
--> $DIR/bad_pat.rs:11:33
|
LL | type Wild = pattern_type!(() is _);