class X::Signature::Placeholder
Error ReportCollection examples

Compilation error due to placeholders in a block with a signature

class X::Signature::Placeholder does X::Comp { }

Compile time error thrown when a block has both an explicit signature and placeholder parameters.

For example

sub f() { $^x }

dies with

Placeholder variable '$^x' cannot override existing signature


method placeholder

method placeholder(--> Str:D)

Returns the name of a placeholder that was used in a block that already had a signature.