# Pastebin XxlZ1rNk
λ raku -Mown-up -e 'grammar Bla { rule TOP {<char>+}; rule char {.*} }; Bla.parse: "asdf"'
^C
==========
Thread 4 (no name set) requested orderly crash


Thread 6 (0x17117b000): Backtrace
... has no code frame

Thread 5 (0x170973000): Backtrace
   at SETTING::src/core.c/ThreadPoolScheduler.rakumod:620  (/opt/homebrew/Cellar/rakudo/2026.02/share/perl6/runtime/CORE.c.setting.moarvm:)
 from SETTING::src/core.c/ThreadPoolScheduler.rakumod:606  (/opt/homebrew/Cellar/rakudo/2026.02/share/perl6/runtime/CORE.c.setting.moarvm:)
 from SETTING::src/core.c/Thread.rakumod:72  (/opt/homebrew/Cellar/rakudo/2026.02/share/perl6/runtime/CORE.c.setting.moarvm:THREAD-ENTRY)

Thread 4 (0x17016b000): Backtrace
   at SETTING::src/core.c/VM.rakumod:103  (/opt/homebrew/Cellar/rakudo/2026.02/share/perl6/runtime/CORE.c.setting.moarvm:own-up)
 from core#sources/34A767FC90C3B0179D8605EA1B055842DF43C69A (own-up):5  (/opt/homebrew/Cellar/rakudo/2026.02/share/perl6/core/precomp/70F9D5B64566C1396866ACF8BC7B450F15C29D74/34/34A767FC90C3B0179D8605EA1B055842DF43C69A:)
 from SETTING::src/core.c/Supply-factories.rakumod:153  (/opt/homebrew/Cellar/rakudo/2026.02/share/perl6/runtime/CORE.c.setting.moarvm:)
 from SETTING::src/core.c/Supply-factories.rakumod:117  (/opt/homebrew/Cellar/rakudo/2026.02/share/perl6/runtime/CORE.c.setting.moarvm:)
 from SETTING::src/core.c/Lock/Async.rakumod:204  (/opt/homebrew/Cellar/rakudo/2026.02/share/perl6/runtime/CORE.c.setting.moarvm:run-under-recursion-list)
 from SETTING::src/core.c/Lock/Async.rakumod:183  (/opt/homebrew/Cellar/rakudo/2026.02/share/perl6/runtime/CORE.c.setting.moarvm:run-with-updated-recursion-list)
 from SETTING::src/core.c/Lock/Async.rakumod:146  (/opt/homebrew/Cellar/rakudo/2026.02/share/perl6/runtime/CORE.c.setting.moarvm:protect-or-queue-on-recursion)
 from SETTING::src/core.c/Supply-factories.rakumod:117  (/opt/homebrew/Cellar/rakudo/2026.02/share/perl6/runtime/CORE.c.setting.moarvm:)
 from SETTING::src/core.c/signals.rakumod:55  (/opt/homebrew/Cellar/rakudo/2026.02/share/perl6/runtime/CORE.c.setting.moarvm:)
 from SETTING::src/core.c/ThreadPoolScheduler.rakumod:269  (/opt/homebrew/Cellar/rakudo/2026.02/share/perl6/runtime/CORE.c.setting.moarvm:)
 from SETTING::src/core.c/ThreadPoolScheduler.rakumod:253  (/opt/homebrew/Cellar/rakudo/2026.02/share/perl6/runtime/CORE.c.setting.moarvm:)
 from SETTING::src/core.c/ThreadPoolScheduler.rakumod:250  (/opt/homebrew/Cellar/rakudo/2026.02/share/perl6/runtime/CORE.c.setting.moarvm:run-one)
 from SETTING::src/core.c/ThreadPoolScheduler.rakumod:301  (/opt/homebrew/Cellar/rakudo/2026.02/share/perl6/runtime/CORE.c.setting.moarvm:)
 from SETTING::src/core.c/Thread.rakumod:72  (/opt/homebrew/Cellar/rakudo/2026.02/share/perl6/runtime/CORE.c.setting.moarvm:THREAD-ENTRY)

Thread 1 (0x20aaf2080): Backtrace
   at -e:1  (<ephemeral file>:char)
 from -e:1  (<ephemeral file>:TOP)
 from SETTING::src/core.c/Grammar.rakumod:9  (/opt/homebrew/Cellar/rakudo/2026.02/share/perl6/runtime/CORE.c.setting.moarvm:parse)
 from -e:1  (<ephemeral file>:<unit>)
 from -e:1  (<ephemeral file>:<unit-outer>)
 from NQP::src/HLL/Compiler.nqp:197  (/opt/homebrew/Cellar/nqp/2026.02/share/nqp/lib/NQPHLL.moarvm:eval)
 from NQP::src/HLL/Compiler.nqp:289  (/opt/homebrew/Cellar/nqp/2026.02/share/nqp/lib/NQPHLL.moarvm:)
 from NQP::src/HLL/Compiler.nqp:286  (/opt/homebrew/Cellar/nqp/2026.02/share/nqp/lib/NQPHLL.moarvm:command_eval)
 from src/Perl6/Compiler.nqp:234  (/opt/homebrew/Cellar/rakudo/2026.02/share/perl6/lib/Perl6/Compiler.moarvm:command_eval)
 from NQP::src/HLL/Compiler.nqp:269  (/opt/homebrew/Cellar/nqp/2026.02/share/nqp/lib/NQPHLL.moarvm:command_line)
 from src/main.nqp:146  (/opt/homebrew/Cellar/rakudo/2026.02/share/perl6/runtime/perl6.moarvm:MAIN)
 from src/main.nqp:65  (/opt/homebrew/Cellar/rakudo/2026.02/share/perl6/runtime/perl6.moarvm:<mainline>)
 from <unknown>:1  (/opt/homebrew/Cellar/rakudo/2026.02/share/perl6/runtime/perl6.moarvm:<main>)
 from <unknown>:1  (/opt/homebrew/Cellar/rakudo/2026.02/share/perl6/runtime/perl6.moarvm:<entry>)