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Auto merge of #56251 - scalexm:root-universe, r=nikomatsakis

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Put all existential ty vars in the `ROOT` universe

r? @nikomatsakis
This commit is contained in:
bors 2018-11-27 15:54:21 +00:00
commit aeff91d977
2 changed files with 13 additions and 7 deletions
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18
src/librustc/infer/canonical/canonicalizer.rs
View File

@ -346,12 +346,18 @@ impl<'cx, 'gcx, 'tcx> TypeFolder<'gcx, 'tcx> for Canonicalizer<'cx, 'gcx, 'tcx>
// `TyVar(vid)` is unresolved, track its universe index in the canonicalized
// result
Err(ui) => self.canonicalize_ty_var(
CanonicalVarInfo {
kind: CanonicalVarKind::Ty(CanonicalTyVarKind::General(ui))
},
t
)
Err(mut ui) => {
if !self.infcx.unwrap().tcx.sess.opts.debugging_opts.chalk {
// FIXME: perf problem described in #55921.
ui = ty::UniverseIndex::ROOT;
}
self.canonicalize_ty_var(
CanonicalVarInfo {
kind: CanonicalVarKind::Ty(CanonicalTyVarKind::General(ui))
},
t
)
}
}
}

2
src/test/ui/nll/user-annotations/dump-fn-method.stderr
View File

@ -16,7 +16,7 @@ error: user substs: Canonical { max_universe: U0, variables: [], value: UserSubs
LL | let x = <u8 as Bazoom<u16>>::method::<u32>; //~ ERROR [u8, u16, u32]
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
error: user substs: Canonical { max_universe: U1, variables: [CanonicalVarInfo { kind: Ty(General(U1)) }, CanonicalVarInfo { kind: Ty(General(U1)) }], value: UserSubsts { substs: [^0, ^1, u32], user_self_ty: None } }
error: user substs: Canonical { max_universe: U0, variables: [CanonicalVarInfo { kind: Ty(General(U0)) }, CanonicalVarInfo { kind: Ty(General(U0)) }], value: UserSubsts { substs: [^0, ^1, u32], user_self_ty: None } }
--> $DIR/dump-fn-method.rs:54:5
|
LL | y.method::<u32>(44, 66); //~ ERROR [^0, ^1, u32]