const internal/types/errors.NotAnExpr

4 uses

	internal/types/errors (current package)
		code_string.go#L52: 	_ = x[NotAnExpr-42]
		codes.go#L412: 	NotAnExpr

	go/types
		expr.go#L1360: 			code = NotAnExpr
		stmt.go#L460: 			code = NotAnExpr