Checking for methodset existance

interp/interpreter.go

@@ -427,6 +427,10 @@ func (r *runner) run(fn *function, params []value, parentMem *memoryView, indent
 				if err != nil {
 					return nil, mem, r.errorAt(inst, err)
 				}
+				if typecodePtr.offset() == 0 {
+					locals[inst.localIndex] = literalValue{uint8(0)}
+					break
+				}
 				typecodePtrOffset, err := typecodePtr.addOffset(-int64(r.pointerSize))
 				if err != nil {
 					return nil, mem, r.errorAt(inst, err) // unlikely

testdata/init.go

@@ -109,3 +109,14 @@ func sliceString(s string, start, end int) string {
 func sliceSlice(s []int, start, end int) []int {
 	return s[start:end]
 }
+
+type outside struct{}
+
+func init() {
+	_, _ = any(0).(interface{ DoesNotExist() })
+	_, _ = any("").(interface{ DoesNotExist() })
+	_, _ = any(outside{}).(interface{ DoesNotExist() })
+
+	type inside struct{}
+	_, _ = any(inside{}).(interface{ DoesNotExist() })
+}