Improve error message for immutable constructor#2
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abulgit
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Feb 6, 2026
Limit the number of platforms that this is done on. A inspection of some libc implementations of fork has identified the main culprits, don't need to apply this to any others. MacOS testsuite also regressed as a result on calling this code, it's not clear why, but the backtrace is: ``` * thread #1, queue = 'com.apple.main-thread', stop reason = EXC_BAD_INSTRUCTION (code=EXC_I386_INVOP, subcode=0x0) * frame #0: 0x00007ff81abe6ee3 libsystem_platform.dylib`_os_unfair_lock_recursive_abort + 23 frame #1: 0x00007ff81abe12da libsystem_platform.dylib`_os_unfair_lock_lock_slow + 247 frame #2: 0x00007ff81abccd44 libsystem_pthread.dylib`_pthread_atfork_prepare_handlers + 48 frame #3: 0x00007ff825dc2705 libSystem.B.dylib`libSystem_atfork_prepare + 25 frame #4: 0x00007ff81aac17e1 libsystem_c.dylib`fork + 24 frame #5: 0x0000000101f730ee test_runner`core.internal.backtrace.dwarf.resolveAddressesWithAtos(Location[]) + 210 ```
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Test in my own repo to check the test passes