X::Mixin::NotComposable Reference

Error due to using an ineligible type as a mixin

What it is #

Routines #

Signatures are reproduced from the documentation, including their declared return types. A routine listed here is part of the type's published interface; whether Raku++ implements it is a separate question, answered by the examples below.

method target #

method target()

Returns the target of the failed mixin operation.

method rolish #

method rolish()

Returns the thing that could not act as a role for mixing it in

Examples, run three ways #

Every example below comes from the official documentation, together with the output that documentation asserts. Each was then executed by Rakudo and by Raku++ when this page was built. Where the three agree, one result is shown; where they do not, all three are — because which of them is wrong is exactly the information worth having.

1 no-output · 1 ok

class X::Mixin::NotComposable is Exception { }

class B { };
1 but B;
CATCH { default { put .^name, ': ', .Str } };
# OUTPUT: «X::Mixin::NotComposable: Cannot mix in non-composable type B into object of type Int␤»

X::Mixin::NotComposable: Cannot mix in non-composable type B into object of type Int