Issue #21012 has been reported by tompng (tomoya ishida). ---------------------------------------- Bug #21012: Compiling `a['a','b'],=1` with parse.y fails https://bugs.ruby-lang.org/issues/21012 * Author: tompng (tomoya ishida) * Status: Open * ruby -v: ruby 3.5.0dev (2025-01-06T01:50:53Z master c8e3d745fa) [x86_64-linux] * Backport: 3.1: UNKNOWN, 3.2: UNKNOWN, 3.3: UNKNOWN, 3.4: UNKNOWN ---------------------------------------- Compiling this code with parse.y fails with segmentation fault. ~~~ruby a['a','b'],=1 ~~~ Compiling `a['a',x],=1` generates instruction sequence that wrong contains `opt_aset_with`. ~~~ $ ruby --parser=parse.y --dump=insn -e "a['a',999],=1" == disasm: #<ISeq:<main>@-e:1 (1,0)-(1,13)> 0000 putself ( 1)[Li] 0001 opt_send_without_block <calldata!mid:a, argc:0, FCALL|VCALL|ARGS_SIMPLE> 0003 putobject_INT2FIX_1_ 0004 dup 0005 expandarray 1, 0 0008 topn 1001 .... 2006 topn 1001 2008 topn 1000 2010 opt_aset_with "a", <calldata!mid:[]=, argc:2, ARGS_SIMPLE> 2013 setn 1000 2015 pop .... 3014 pop 3015 leave ~~~ -- https://bugs.ruby-lang.org/