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Last active July 23, 2020 13:59
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gistfile1.txt
> my %image-formats = JPEG => '.jpeg', PNG => '.png', WebP => '.webp', GIF => '.gif';
{GIF => .gif, JPEG => .jpeg, PNG => .png, WebP => .webp}
> subset ImageFormat of Str where * ~~ %image-formats;
(ImageFormat)
> sub f(ImageFormat :$format = "PNG") { say $format }
&f
> f()
Constraint type check failed in binding to parameter '$format'; expected ImageFormat but got Str ("PNG")
in sub f at <unknown file> line 1
in block <unit> at <unknown file> line 1
>
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