From type/IO/Spec/Cygwin

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method abs2rel(IO::Path:D $path, IO::Path:D $base = $*CWD --> Str:D)

Returns a string that represents $path, but relative to $base path. Both $path and $base may be relative paths. $base defaults to $*CWD. Uses IO::Spec::Win32's semantics.

From type/IO/Spec/Unix

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method abs2rel(IO::Path:D $path, IO::Path:D $base = $*CWD --> Str:D)

Returns a string that represents $path, but relative to $base path. Both $path and $base may be relative paths. $base defaults to $*CWD.