bjoernager/rust
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Refactor AST trait bound modifiers

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This commit is contained in:
León Orell Valerian Liehr 2023-12-20 15:22:06 +01:00
parent bf9229a2e3
commit 5e4f12b41a
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GPG key ID: D17A07215F68E713
16 changed files with 195 additions and 201 deletions
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33
compiler/rustc_ast_passes/src/ast_validation.rs
View file

@ -1196,18 +1196,18 @@ impl<'a> Visitor<'a> for AstValidator<'a> {
}
fn visit_param_bound(&mut self, bound: &'a GenericBound, ctxt: BoundKind) {
if let GenericBound::Trait(poly, modify) = bound {
match (ctxt, modify) {
(BoundKind::SuperTraits, TraitBoundModifier::Maybe) => {
if let GenericBound::Trait(poly, modifiers) = bound {
match (ctxt, modifiers.constness, modifiers.polarity) {
(BoundKind::SuperTraits, BoundConstness::Never, BoundPolarity::Maybe(_)) => {
self.dcx().emit_err(errors::OptionalTraitSupertrait {
span: poly.span,
path_str: pprust::path_to_string(&poly.trait_ref.path),
});
}
(BoundKind::TraitObject, TraitBoundModifier::Maybe) => {
(BoundKind::TraitObject, BoundConstness::Never, BoundPolarity::Maybe(_)) => {
self.dcx().emit_err(errors::OptionalTraitObject { span: poly.span });
}
(_, &TraitBoundModifier::MaybeConst(span))
(_, BoundConstness::Maybe(span), BoundPolarity::Positive)
if let Some(reason) = &self.disallow_tilde_const =>
{
let reason = match reason {
@ -1235,16 +1235,15 @@ impl<'a> Visitor<'a> for AstValidator<'a> {
};
self.dcx().emit_err(errors::TildeConstDisallowed { span, reason });
}
(_, TraitBoundModifier::MaybeConstMaybe) => {
self.dcx().emit_err(errors::OptionalConstExclusive {
(
_,
BoundConstness::Maybe(_),
BoundPolarity::Maybe(_) | BoundPolarity::Negative(_),
) => {
self.dcx().emit_err(errors::IncompatibleTraitBoundModifiers {
span: bound.span(),
modifier: "?",
});
}
(_, TraitBoundModifier::MaybeConstNegative) => {
self.dcx().emit_err(errors::OptionalConstExclusive {
span: bound.span(),
modifier: "!",
left: modifiers.constness.as_str(),
right: modifiers.polarity.as_str(),
});
}
_ => {}
@ -1252,7 +1251,8 @@ impl<'a> Visitor<'a> for AstValidator<'a> {
}
// Negative trait bounds are not allowed to have associated constraints
if let GenericBound::Trait(trait_ref, TraitBoundModifier::Negative) = bound
if let GenericBound::Trait(trait_ref, modifiers) = bound
&& let BoundPolarity::Negative(_) = modifiers.polarity
&& let Some(segment) = trait_ref.trait_ref.path.segments.last()
&& let Some(ast::GenericArgs::AngleBracketed(args)) = segment.args.as_deref()
{
@ -1494,7 +1494,8 @@ fn deny_equality_constraints(
for param in &generics.params {
if param.ident == potential_param.ident {
for bound in &param.bounds {
if let ast::GenericBound::Trait(trait_ref, TraitBoundModifier::None) = bound
if let ast::GenericBound::Trait(trait_ref, TraitBoundModifiers::NONE) =
bound
{
if let [trait_segment] = &trait_ref.trait_ref.path.segments[..] {
let assoc = pprust::path_to_string(&ast::Path::from_ident(

7
compiler/rustc_ast_passes/src/errors.rs
View file

@ -580,11 +580,12 @@ pub enum TildeConstReason {
}
#[derive(Diagnostic)]
#[diag(ast_passes_optional_const_exclusive)]
pub struct OptionalConstExclusive {
#[diag(ast_passes_incompatible_trait_bound_modifiers)]
pub struct IncompatibleTraitBoundModifiers {
#[primary_span]
pub span: Span,
pub modifier: &'static str,
pub left: &'static str,
pub right: &'static str,
}
#[derive(Diagnostic)]