X::Role::Initialization Reference

Error due to passing an initialization value to an ineligible role

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 role #

method role()

Returns the role that caused the error.

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 unrun

class X::Role::Initialization is Exception { }

role R { }; "D2" but R(2)
CATCH { default { put .^name, ': ', .Str } }
# OUTPUT: «X::Role::Initialization: Can only supply an initialization value for a role if it has a single public attribute, but this is not the case for 'R'␤»