Issue #22334 has been reported by 0599jiangyc@gmail.com (Yuancheng Jiang). ---------------------------------------- Bug #22334: Assertion Failed: VM_ENV_FLAGS:FIXNUM_P(flags) https://bugs.ruby-lang.org/issues/22334 * Author: 0599jiangyc@gmail.com (Yuancheng Jiang) * Status: Open * Backport: 3.3: UNKNOWN, 3.4: UNKNOWN, 4.0: UNKNOWN ---------------------------------------- The following code: ```ruby def r; return **[nil]; end; r() ``` Resulted in this output: ``` ../vm_core.h:1554: Assertion Failed: VM_ENV_FLAGS:FIXNUM_P(flags) ruby 4.1.0dev (2026-09-15T05:36:12Z master 3296d5c99c) +PRISM [x86_64-linux] -- Control frame information ----------------------------------------------- ../vm_core.h:1554: Assertion Failed: VM_ENV_FLAGS:FIXNUM_P(flags) ruby 4.1.0dev (2026-09-15T05:36:12Z master 3296d5c99c) +PRISM [x86_64-linux] Crashed while printing bug report Aborted (core dumped) ``` *This bug was found by [fusion-fuzz](https://github.com/fusion-fuzz/fusion-fuzz)* -- https://bugs.ruby-lang.org/