diff options
Diffstat (limited to 'src/cmd/compile/internal/types2/subst.go')
| -rw-r--r-- | src/cmd/compile/internal/types2/subst.go | 18 |
1 files changed, 5 insertions, 13 deletions
diff --git a/src/cmd/compile/internal/types2/subst.go b/src/cmd/compile/internal/types2/subst.go index a2b81ba0cc..bfec61a065 100644 --- a/src/cmd/compile/internal/types2/subst.go +++ b/src/cmd/compile/internal/types2/subst.go @@ -298,21 +298,13 @@ func (subst *subster) typ(typ Type) Type { } } - case *Sum: - types, copied := subst.typeList(t.types) - if copied { - // Don't do it manually, with a Sum literal: the new - // types list may not be unique and NewSum may remove - // duplicates. - return NewSum(types) - } - case *Union: - terms, copied := subst.typeList(t.terms) + types, copied := subst.typeList(t.types) if copied { - // TODO(gri) Do we need to remove duplicates that may have - // crept in after substitution? It may not matter. - return newUnion(terms, t.tilde) + // TODO(gri) Remove duplicates that may have crept in after substitution + // (unlikely but possible). This matters for the Identical + // predicate on unions. + return newUnion(types, t.tilde) } case *Interface: |