bjoernager/rust
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PatKind::Path: avoid calling resolve_ty_and_res_ufcs twice.

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This commit is contained in:
Mazdak Farrokhzad 2019-06-14 09:00:21 +02:00
parent cdd743755a
commit d3024138f8
1 changed files with 8 additions and 5 deletions
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13
src/librustc_typeck/check/_match.rs
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@ -50,6 +50,7 @@ impl<'a, 'gcx, 'tcx> FnCtxt<'a, 'gcx, 'tcx> {
debug!("check_pat_walk(pat={:?},expected={:?},def_bm={:?})", pat, expected, def_bm);
let mut path_resolution = None;
let is_non_ref_pat = match pat.node {
PatKind::Struct(..) |
PatKind::TupleStruct(..) |
@ -65,8 +66,9 @@ impl<'a, 'gcx, 'tcx> FnCtxt<'a, 'gcx, 'tcx> {
}
}
PatKind::Path(ref qpath) => {
let (def, _, _) = self.resolve_ty_and_res_ufcs(qpath, pat.hir_id, pat.span);
match def {
let resolution = self.resolve_ty_and_res_ufcs(qpath, pat.hir_id, pat.span);
path_resolution = Some(resolution);
match resolution.0 {
Res::Def(DefKind::Const, _) | Res::Def(DefKind::AssocConst, _) => false,
_ => true,
}
@ -294,7 +296,7 @@ impl<'a, 'gcx, 'tcx> FnCtxt<'a, 'gcx, 'tcx> {
)
}
PatKind::Path(ref qpath) => {
self.check_pat_path(pat, qpath, expected)
self.check_pat_path(pat, path_resolution.unwrap(), qpath, expected)
}
PatKind::Struct(ref qpath, ref fields, etc) => {
self.check_pat_struct(pat, qpath, fields, etc, expected, def_bm, discrim_span)
@ -1055,13 +1057,14 @@ https://doc.rust-lang.org/reference/types.html#trait-objects");
fn check_pat_path(
&self,
pat: &hir::Pat,
path_resolution: (Res, Option<Ty<'tcx>>, &'b [hir::PathSegment]),
qpath: &hir::QPath,
expected: Ty<'tcx>,
) -> Ty<'tcx> {
let tcx = self.tcx;
// Resolve the path and check the definition for errors.
let (res, opt_ty, segments) = self.resolve_ty_and_res_ufcs(qpath, pat.hir_id, pat.span);
// We have already resolved the path.
let (res, opt_ty, segments) = path_resolution;
match res {
Res::Err => {
self.set_tainted_by_errors();