bjoernager/rust
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Replace tuple of infer vars for upvar_tys with single infer var

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This commit allows us to decide the number of captures required after
completing capture ananysis, which is required as part of implementing
RFC-2229.

Co-authored-by: Aman Arora <me@aman-arora.com>
Co-authored-by: Jenny Wills <wills.jenniferg@gmail.com>
This commit is contained in:
Roxane 2020-07-19 17:26:51 -04:00 • committed by Aman Arora
parent 25d2d09da7
commit dc183702da
23 changed files with 178 additions and 95 deletions
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24
compiler/rustc_traits/src/dropck_outlives.rs
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@ -210,12 +210,20 @@ fn dtorck_constraint_for_ty<'tcx>(
Ok::<_, NoSolution>(())
})?,
ty::Closure(_, substs) => rustc_data_structures::stack::ensure_sufficient_stack(|| {
for ty in substs.as_closure().upvar_tys() {
dtorck_constraint_for_ty(tcx, span, for_ty, depth + 1, ty, constraints)?;
ty::Closure(_, substs) => {
if !substs.as_closure().is_valid() {
// By the time this code runs, all type variables ought to
// be fully resolved.
return Err(NoSolution);
}
Ok::<_, NoSolution>(())
})?,
rustc_data_structures::stack::ensure_sufficient_stack(|| {
for ty in substs.as_closure().upvar_tys() {
dtorck_constraint_for_ty(tcx, span, for_ty, depth + 1, ty, constraints)?;
}
Ok::<_, NoSolution>(())
})?
}
ty::Generator(_, substs, _movability) => {
// rust-lang/rust#49918: types can be constructed, stored
@ -241,6 +249,12 @@ fn dtorck_constraint_for_ty<'tcx>(
// derived from lifetimes attached to the upvars and resume
// argument, and we *do* incorporate those here.
if !substs.as_generator().is_valid() {
// By the time this code runs, all type variables ought to
// be fully resolved.
return Err(NoSolution);
}
constraints.outlives.extend(
substs
.as_generator()