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use relevant span when unifying ConstVarValues

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This commit is contained in:
Bastian Kauschke 2020-09-23 11:00:44 +02:00
parent 3dbfdb0182
commit 0e84b61053
2 changed files with 9 additions and 8 deletions
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3
compiler/rustc_infer/src/infer/error_reporting/need_type_info.rs
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@ -309,7 +309,8 @@ impl<'a, 'tcx> InferCtxt<'a, 'tcx> {
);
}
Some(origin.span).filter(|s| !s.is_dummy())
debug_assert!(!origin.span.is_dummy());
Some(origin.span)
} else {
bug!("unexpect const: {:?}", ct);
};

14
compiler/rustc_middle/src/infer/unify_key.rs
View File

@ -6,7 +6,7 @@ use rustc_data_structures::unify::{
};
use rustc_span::def_id::DefId;
use rustc_span::symbol::Symbol;
use rustc_span::{Span, DUMMY_SP};
use rustc_span::Span;
use std::cmp;
use std::marker::PhantomData;
@ -176,17 +176,17 @@ impl<'tcx> UnifyValue for ConstVarValue<'tcx> {
type Error = (&'tcx ty::Const<'tcx>, &'tcx ty::Const<'tcx>);
fn unify_values(value1: &Self, value2: &Self) -> Result<Self, Self::Error> {
let val = match (value1.val, value2.val) {
let (val, span) = match (value1.val, value2.val) {
(ConstVariableValue::Known { .. }, ConstVariableValue::Known { .. }) => {
bug!("equating two const variables, both of which have known values")
}
// If one side is known, prefer that one.
(ConstVariableValue::Known { .. }, ConstVariableValue::Unknown { .. }) => {
Ok(value1.val)
(value1.val, value1.origin.span)
}
(ConstVariableValue::Unknown { .. }, ConstVariableValue::Known { .. }) => {
Ok(value2.val)
(value2.val, value2.origin.span)
}
// If both sides are *unknown*, it hardly matters, does it?
@ -200,14 +200,14 @@ impl<'tcx> UnifyValue for ConstVarValue<'tcx> {
// universe is the minimum of the two universes, because that is
// the one which contains the fewest names in scope.
let universe = cmp::min(universe1, universe2);
Ok(ConstVariableValue::Unknown { universe })
(ConstVariableValue::Unknown { universe }, value1.origin.span)
}
}?;
};
Ok(ConstVarValue {
origin: ConstVariableOrigin {
kind: ConstVariableOriginKind::ConstInference,
span: DUMMY_SP,
span: span,
},
val,
})