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Bounds parsing refactoring 2 #39158

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merged 5 commits into from
Jan 27, 2017
Merged

Bounds parsing refactoring 2 #39158

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b795abe
Refactor parsing of generic arguments/parameters and where clauses
petrochenkov Jan 17, 2017
a8f5047
Add tests
petrochenkov Jan 18, 2017
375cb2e
Improve some expected/found error messages from parser
petrochenkov Jan 18, 2017
65aeafa
parser: Permit trailing +'s in bound lists
petrochenkov Jan 24, 2017
bd4d5ec
Better comments for FIXMEs
petrochenkov Jan 26, 2017
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26 changes: 26 additions & 0 deletions src/librustc_passes/ast_validation.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -146,6 +146,12 @@ impl<'a> Visitor<'a> for AstValidator<'a> {
TyKind::TraitObject(ref bounds) => {
self.no_questions_in_bounds(bounds, "trait object types", false);
}
TyKind::ImplTrait(ref bounds) => {
if !bounds.iter()
.any(|b| if let TraitTyParamBound(..) = *b { true } else { false }) {
self.err_handler().span_err(ty.span, "at least one trait must be specified");
}
}
_ => {}
}

Expand Down Expand Up @@ -284,6 +290,26 @@ impl<'a> Visitor<'a> for AstValidator<'a> {

visit::walk_vis(self, vis)
}

fn visit_generics(&mut self, g: &'a Generics) {
let mut seen_default = None;
for ty_param in &g.ty_params {
if ty_param.default.is_some() {
seen_default = Some(ty_param.span);
} else if let Some(span) = seen_default {
self.err_handler()
.span_err(span, "type parameters with a default must be trailing");
break
}
}
for predicate in &g.where_clause.predicates {
if let WherePredicate::EqPredicate(ref predicate) = *predicate {
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heh, we should really remove this variant from the compiler (and parser)

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to be clear, not as part of this PR =)

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There are no plans to implement this?
Then #20041 should be officially closed or something before removing WherePredicate::EqPredicate.

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Well, eventually perhaps, but at the moment there are some theoretical limitations that I do not yet know how to overcome. I would say "we may implement it eventually, but in that case we can add that stuff back in to the compiler".

self.err_handler().span_err(predicate.span, "equality constraints are not yet \
supported in where clauses (#20041)");
}
}
visit::walk_generics(self, g)
}
}

pub fn check_crate(session: &Session, krate: &Crate) {
Expand Down
5 changes: 1 addition & 4 deletions src/librustc_typeck/collect.rs
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Expand Up @@ -1833,11 +1833,8 @@ fn ty_generic_predicates<'a,'tcx>(ccx: &CrateCtxt<'a,'tcx>,
}
}

&hir::WherePredicate::EqPredicate(ref eq_pred) => {
&hir::WherePredicate::EqPredicate(..) => {
// FIXME(#20041)
span_bug!(eq_pred.span,
"Equality constraints are not yet \
implemented (#20041)")
}
}
}
Expand Down
7 changes: 5 additions & 2 deletions src/librustdoc/clean/mod.rs
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Expand Up @@ -842,8 +842,11 @@ impl Clean<WherePredicate> for hir::WherePredicate {
}
}

hir::WherePredicate::EqPredicate(_) => {
unimplemented!() // FIXME(#20041)
hir::WherePredicate::EqPredicate(ref wrp) => {
WherePredicate::EqPredicate {
lhs: wrp.lhs_ty.clean(cx),
rhs: wrp.rhs_ty.clean(cx)
}
}
}
}
Expand Down
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