Issue #21460 has been updated by bendrissou (Bachir Bendrissou). Subject changed from Pattern matching crash: unexpected `PM_CALL_NODE` to Pattern matching crash: unexpected PM_CALL_NODE Hi, Pattern matching crashes when using an arithmetic expression like `-1**2` in a hash pattern. Ruby attempts to process the expression as a PM_CALL_NODE, which results in a compiler crash rather than a syntax or match error. ### Input ``` foo => -1**2 ``` ### Output ``` input.rb: [BUG] Unexpected node type in pattern matching expression: PM_CALL_NODE ruby 3.5.0dev (2025-06-11T18:07:43Z master 970813d982) +PRISM [x86_64-linux] -- Control frame information ----------------------------------------------- c:0001 p:0000 s:0003 E:000720 DUMMY [FINISH] -- Threading information --------------------------------------------------- Total ractor count: 1 Ruby thread count for this ractor: 1 -- C level backtrace information ------------------------------------------- /lib/x86_64-linux-gnu/libasan.so.5(__interceptor_backtrace+0x40) [0x7f0716ea0d40] ../../../../src/libsanitizer/sanitizer_common/sanitizer_common_interceptors.inc:4022 /home/program/build/ruby(rb_print_backtrace+0x11) [0x55d00b05dda9] ../vm_dump.c:843 /home/program/build/ruby(rb_vm_bugreport) ../vm_dump.c:1175 /home/program/build/ruby(rb_bug_without_die_internal+0xc5) [0x55d00a720b21] ../error.c:1097 /home/program/build/ruby(rb_bug) ../error.c:1115 /home/program/build/ruby(pm_compile_pattern+0x3e76) [0x55d00aee1b46] ../prism_compile.c:3171 /home/program/build/ruby(ADD_ELEM+0x0) [0x55d00aeb2793] ../prism_compile.c:8125 /home/program/build/ruby(pm_compile_match_required_node) ../prism_compile.c:8130 /home/program/build/ruby(pm_compile_node) ../prism_compile.c:9847 /home/program/build/ruby(pm_compile_node+0x529d) [0x55d00aea7bdd] ../prism_compile.c:10330 /home/program/build/ruby(pm_compile_scope_node+0x3f42) [0x55d00aeff382] ../prism_compile.c:7012 /home/program/build/ruby(pm_compile_node+0x1b50) [0x55d00aea4490] ../prism_compile.c:10201 /home/program/build/ruby(APPEND_LIST+0x0) [0x55d00af062a4] ../prism_compile.c:10502 /home/program/build/ruby(pm_iseq_compile_node) ../prism_compile.c:10506 /home/program/build/ruby(pm_iseq_new_with_opt_try+0x3e) [0x55d00a840c5e] ../iseq.c:1050 /home/program/build/ruby(rb_protect+0x30f) [0x55d00a7343ff] ../eval.c:1059 /home/program/build/ruby(pm_iseq_new_with_opt+0x482) [0x55d00a84ec12] ../iseq.c:1103 /home/program/build/ruby(pm_iseq_new_main+0xbc) [0x55d00a84f2ac] ../iseq.c:951 /home/program/build/ruby(process_options+0x2d32) [0x55d00a9eeb12] ../ruby.c:2641 /home/program/build/ruby(ruby_process_options+0x3f0) [0x55d00a9f1290] ../ruby.c:3199 /home/program/build/ruby(ruby_options+0x2a7) [0x55d00a731407] ../eval.c:117 /home/program/build/ruby(rb_main+0x19) [0x55d00a7227ff] ../main.c:42 /home/program/build/ruby(main) ../main.c:62 /lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xf3) [0x7f07169ec083] /home/program/build/ruby(_start) [0x55d00a723dce] -- Other runtime information ----------------------------------------------- * Loaded script: input.rb * Loaded features: 0 enumerator.so 1 thread.rb 2 fiber.so 3 rational.so 4 complex.so 5 ruby2_keywords.rb 6 set.rb Aborted ``` ### Environment Ruby version: ruby 3.5.0dev (2025-06-11 commit 970813d982) +PRISM Platform: x86_64-linux Built from source Parser backend: Prism (default) ---------------------------------------- Bug #21460: Pattern matching crash: unexpected PM_CALL_NODE https://bugs.ruby-lang.org/issues/21460#change-113864 * Author: bendrissou (Bachir Bendrissou) * Status: Open * ruby -v: ruby 3.5.0dev (2025-06-11 commit 970813d982) +PRISM * Backport: 3.2: UNKNOWN, 3.3: UNKNOWN, 3.4: UNKNOWN ---------------------------------------- Hi, Pattern matching crashes when using an arithmetic expression like `-1**2` in a hash pattern. Ruby attempts to process the expression as a PM_CALL_NODE, which results in a compiler crash rather than a syntax or match error. ### Input ``` foo => -1**2 ``` ### Output ``` input.rb: [BUG] Unexpected node type in pattern matching expression: PM_CALL_NODE ruby 3.5.0dev (2025-06-11T18:07:43Z master 970813d982) +PRISM [x86_64-linux] -- Control frame information ----------------------------------------------- c:0001 p:0000 s:0003 E:000720 DUMMY [FINISH] -- Threading information --------------------------------------------------- Total ractor count: 1 Ruby thread count for this ractor: 1 -- C level backtrace information ------------------------------------------- /lib/x86_64-linux-gnu/libasan.so.5(__interceptor_backtrace+0x40) [0x7f0716ea0d40] ../../../../src/libsanitizer/sanitizer_common/sanitizer_common_interceptors.inc:4022 /home/program/build/ruby(rb_print_backtrace+0x11) [0x55d00b05dda9] ../vm_dump.c:843 /home/program/build/ruby(rb_vm_bugreport) ../vm_dump.c:1175 /home/program/build/ruby(rb_bug_without_die_internal+0xc5) [0x55d00a720b21] ../error.c:1097 /home/program/build/ruby(rb_bug) ../error.c:1115 /home/program/build/ruby(pm_compile_pattern+0x3e76) [0x55d00aee1b46] ../prism_compile.c:3171 /home/program/build/ruby(ADD_ELEM+0x0) [0x55d00aeb2793] ../prism_compile.c:8125 /home/program/build/ruby(pm_compile_match_required_node) ../prism_compile.c:8130 /home/program/build/ruby(pm_compile_node) ../prism_compile.c:9847 /home/program/build/ruby(pm_compile_node+0x529d) [0x55d00aea7bdd] ../prism_compile.c:10330 /home/program/build/ruby(pm_compile_scope_node+0x3f42) [0x55d00aeff382] ../prism_compile.c:7012 /home/program/build/ruby(pm_compile_node+0x1b50) [0x55d00aea4490] ../prism_compile.c:10201 /home/program/build/ruby(APPEND_LIST+0x0) [0x55d00af062a4] ../prism_compile.c:10502 /home/program/build/ruby(pm_iseq_compile_node) ../prism_compile.c:10506 /home/program/build/ruby(pm_iseq_new_with_opt_try+0x3e) [0x55d00a840c5e] ../iseq.c:1050 /home/program/build/ruby(rb_protect+0x30f) [0x55d00a7343ff] ../eval.c:1059 /home/program/build/ruby(pm_iseq_new_with_opt+0x482) [0x55d00a84ec12] ../iseq.c:1103 /home/program/build/ruby(pm_iseq_new_main+0xbc) [0x55d00a84f2ac] ../iseq.c:951 /home/program/build/ruby(process_options+0x2d32) [0x55d00a9eeb12] ../ruby.c:2641 /home/program/build/ruby(ruby_process_options+0x3f0) [0x55d00a9f1290] ../ruby.c:3199 /home/program/build/ruby(ruby_options+0x2a7) [0x55d00a731407] ../eval.c:117 /home/program/build/ruby(rb_main+0x19) [0x55d00a7227ff] ../main.c:42 /home/program/build/ruby(main) ../main.c:62 /lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xf3) [0x7f07169ec083] /home/program/build/ruby(_start) [0x55d00a723dce] -- Other runtime information ----------------------------------------------- * Loaded script: input.rb * Loaded features: 0 enumerator.so 1 thread.rb 2 fiber.so 3 rational.so 4 complex.so 5 ruby2_keywords.rb 6 set.rb Aborted ``` ### Environment Ruby version: ruby 3.5.0dev (2025-06-11 commit 970813d982) +PRISM Platform: x86_64-linux Built from source Parser backend: Prism (default) -- https://bugs.ruby-lang.org/