What is mildew?

Mildew is a compiler that uses as its parser and SMOP as its runtime. It's mainly developed by Pawel Murias and Daniel Ruoso.

What works?

The development of mildew is not feature-oriented, so we support a very small subset of the language features, but that is not really bad news. Mildew development is concept-oriented, so that means we fully support some Perl 6 concepts that are not yet supported by other implementations, like the "return" routine.

Mildew has its own test suite, which is located at

Relevant features

p5 integration

return semantics


multi subs


.() overload and capture expansion



What doesn't work

Most of the spec is not yet implemented, take a look at the test suite to see what already works.