X::Signature::Placeholder Reference
Compilation error due to placeholders in a block with 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 placeholder #
method placeholder(--> Str:D)Returns Str:D.
Returns the name of a placeholder that was used in a block that already had a signature.
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::Signature::Placeholder does X::Comp { }Not executed: the documentation states no expected output for this example.
sub f() { $^x }Not executed: the documentation states no expected output for this example.
Placeholder variable '$^x' cannot override existing signature
Not executed: the documentation states no expected output for this example.