func go/types.NewUnion

4 uses

	go/types (current package)
		builtins.go#L1004: 		ptyp := check.newTypeParam(tpar, NewInterfaceType(nil, []Type{NewUnion(terms)})) // assigns type to tpar as a side-effect
		union.go#L23: func NewUnion(terms []*Term) *Union {

	golang.org/x/tools/internal/gcimporter
		iimport.go#L1024: 		return types.NewUnion(terms)
		ureader_yes.go#L409: 	return types.NewUnion(terms)