segfault with macro

[coke]

Arguably, this could either print out 0 and stop, or it could complain about a bad label.

Currently, it segfaults.

(While macro taken verbatim from hllmacros.pir)

$ more foo.pir
.macro While(conditional, code)
.label $beginwhile:
    unless .conditional goto .$endwhile
    .code
  goto .$beginwhile
.label $endwhile:
.endm

.sub main
.While($I0 < 3, {
say $I0
goto .$endwhile
inc $I0
})
.end

[coke]

Still occurring in r42564.

[chromatic]

The segfault is in IMCC due to a missing label name; confirmed with 2.0.0. I can poke at this.

[chromatic]

Fixed in r43532 and test added to t/compilers/imcc/syn/macro.t. Thanks!