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

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

For example

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sub f() { $^x }

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dies with

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===SORRY!===
Placeholder variable '$^x' cannot override existing signature

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Methods §

method placeholder §

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method placeholder(--> Str:D)

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