X::Parameter::Placeholder Reference
Compilation error due to an unallowed placeholder in a signature
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 parameter #
The text of the offensive parameter declaration ($:param in the example above).
method right #
Suggestion on how to write the parameter declaration instead (:$param in the example above).
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.
3 no-output
class X::Parameter::Placeholder does X::Comp { }Not executed: the documentation states no expected output for this example.
sub f($:param) { }Not executed: the documentation states no expected output for this example.
In signature parameter, placeholder variables like $:param are illegal you probably meant a named parameter: ':$param'
Not executed: the documentation states no expected output for this example.