From @zoffixznet

zoffix@​leliana​:/tmp/tmp.tEaH2sjXYg$ tree
.
├── A.pm6
└── B.pm6

0 directories, 2 files
zoffix@​leliana​:/tmp/tmp.tEaH2sjXYg$ cat B.pm6
unit module B;
use soft;
&put.wrap(sub (| is raw) {say "We're here!"; callsame});
zoffix@​leliana​:/tmp/tmp.tEaH2sjXYg$ cat A.pm6
unit module A;
use B;
zoffix@​leliana​:/tmp/tmp.tEaH2sjXYg$ perl6 -I. -MA -e 'put "foo"'
Segmentation fault
zoffix@​leliana​:/tmp/tmp.tEaH2sjXYg$

From @zoffixznet

Worth noting​: if you add `no precompilation;` at the top of module B.pm6, the bug disappears.