diff options
| -rw-r--r-- | src/cmd/compile/internal/types2/subst.go | 11 |
1 files changed, 8 insertions, 3 deletions
diff --git a/src/cmd/compile/internal/types2/subst.go b/src/cmd/compile/internal/types2/subst.go index ed3fd654a0..2c0fc6e391 100644 --- a/src/cmd/compile/internal/types2/subst.go +++ b/src/cmd/compile/internal/types2/subst.go @@ -222,10 +222,15 @@ func (subst *subster) typ(typ Type) Type { return named } - // create a new named type and populate typMap to avoid endless recursion + // Create a new named type and populate typMap to avoid endless recursion. + // The position used here is irrelevant because validation only occurs on t + // (we don't call validType on named), but we use subst.pos to help with + // debugging. tname := NewTypeName(subst.pos, t.obj.pkg, t.obj.name, nil) t.load() - named := subst.check.newNamed(tname, t.orig, t.underlying, t.TParams(), t.methods) // method signatures are updated lazily + // It's ok to provide a nil *Checker because the newly created type + // doesn't need to be (lazily) expanded; it's expanded below. + named := (*Checker)(nil).newNamed(tname, t.orig, nil, t.tparams, t.methods) // t is loaded, so tparams and methods are available named.targs = newTArgs subst.typMap[h] = named t.expand(subst.typMap) // must happen after typMap update to avoid infinite recursion @@ -235,7 +240,7 @@ func (subst *subster) typ(typ Type) Type { named.underlying = subst.typOrNil(t.underlying) dump(">>> underlying: %v", named.underlying) assert(named.underlying != nil) - named.fromRHS = named.underlying // for cycle detection (Checker.validType) + named.fromRHS = named.underlying // for consistency, though no cycle detection is necessary return named |