self-using mixin applied to a free function

Why this fires¶

A mixin that references self is a method mixin. Applying it to a free function would leave self without a receiver.

@mixin
fn named() -> str { self.name }

@named
fn value() -> str { "value" }
// ^ error[TM112]

Fix it¶

Apply the mixin to an impl method, or remove the receiver dependency and write the mixin only in terms of super(...) and its configuration values.

See also¶

• TM114 — the concretely typed mixin result is incompatible.
• docs/08-decorators.md — method mixins.