With the removal of `LintDiagnostic::msg` / the `msg` param from lint diag APIs, primary messages for lint diags are always constructed lazily inside decorator fns rendering this wrapper type unused / useless.
With the removal of `LintDiagnostic::msg` / the `msg` param from lint diag APIs, primary messages for lint diags are always constructed lazily inside decorator fns rendering this wrapper type unused / useless.