title: FRAME pallets warning for unchecked weight witness

doc:
  - audience: Core Dev
    description: |
      FRAME pallets now emit a warning when a call uses a function argument that starts with an underscore in its weight declaration.

migrations:
  db: [ ]
  runtime: [ ]

host_functions: []

crates:
- name: "frame-support-procedural"
  semver: minor