error: This argument to `schema_for!` is not a type - did you mean to use `schema_for_value!` instead?
 --> $DIR/schema_for_arg_value.rs:4:19
  |
4 |     let _schema = schema_for!(123);
  |                   ^^^^^^^^^^^^^^^^
  |
  = note: this error originates in the macro `schema_for` (in Nightly builds, run with -Z macro-backtrace for more info)