4204: Use specific pattern when translating if-let-else to match r=matklad a=matklad
We *probably* should actually use the same machinery here, as we do
for fill match arms, but just special-casing options and results seems
to be a good first step.
bors r+
🤖
Co-authored-by: Aleksey Kladov <aleksey.kladov@gmail.com>
c3dfeba165