or-patterns: liveness: `is_argument` -> `is_param`.
or-patterns: liveness: `is_argument` -> `is_param`.

Pacify `tidy`. It's also more correct in this context.

aidancully/rust,aidancully/rust,aidancully/rust,aidancully/rust,graydon/rust,aidancully/rust,aidancully/rust,graydon/rust,graydon/rust,graydon/rust,graydon/rust,graydon/rust