ICE: The latest compiler appears to have internal problems with previous builds

[gmlewis]

This ICE appears to only happen when the "_build" and ".mooncakes" directories from a previous version of the compiler are left around.
If I run "moon test -j 12 --target all" when these directories are around, I get the dump below.
However, if I run:

$ rm -rf _build .mooncakes

Then everything compiles and tests successfully without any errors whatsoever.

Here is the dump:

glenn@glenn-MacM2Pro ~/src/github.com/gmlewis/moonbit-01-base64 (master) $ ./update.sh
+ moon update
failed to update registry, re-cloning
Registry index re-cloned successfully
Symbols updated successfully
+ rm -rf target
+ moon fmt
Finished. moon: no work to do
+ moon info
Finished. moon: no work to do
+ moon test -j 12 --target all
         --  --
       /  //  / __--------_
      /  //  /_/            \
   ---      -                \ __
  / X        /        ____   /   )
  *_________/__/_____/______/ `--
Oops, the compiler has encountered an unexpected situation.
This is a bug in the compiler.
A bug report containing the error description and relevant code would be
greatly appreciated. You can submit the bug report here:
  https://github.com/moonbitlang/moonbit-docs/issues/new?template=ice.md
Error: Moonc.Basic_hashf.Make(Key).Key_not_found(_)
Compiler args: /Users/glenn/.moon/bin/moonc link-core /Users/glenn/.moon/lib/core/_build/wasm/release/bundle/abort/abort.core /Users/glenn/.moon/lib/core/_build/wasm/release/bundle/core.core /Users/glenn/src/github.com/gmlewis/moonbit-01-base64/_build/wasm/debug/test/base64.core /Users/glenn/src/github.com/gmlewis/moonbit-01-base64/_build/wasm/debug/test/base64.blackbox_test.core -main gmlewis/base64_blackbox_test -o /Users/glenn/src/github.com/gmlewis/moonbit-01-base64/_build/wasm/debug/test/base64.blackbox_test.wasm -test-mode -pkg-config-path /Users/glenn/src/github.com/gmlewis/moonbit-01-base64/moon.pkg -pkg-sources gmlewis/base64:/Users/glenn/src/github.com/gmlewis/moonbit-01-base64 -pkg-sources gmlewis/base64_blackbox_test:/Users/glenn/src/github.com/gmlewis/moonbit-01-base64 -pkg-sources moonbitlang/core:/Users/glenn/.moon/lib/core -exported_functions moonbit_test_driver_internal_execute,moonbit_test_driver_finish -target wasm -g -O0
moonc version: v0.8.2+3382e0600
         --  --
       /  //  / __--------_
      /  //  /_/            \
   ---      -                \ __
  / X        /        ____   /   )
  *_________/__/_____/______/ `--
Oops, the compiler has encountered an unexpected situation.
This is a bug in the compiler.
A bug report containing the error description and relevant code would be
greatly appreciated. You can submit the bug report here:
  https://github.com/moonbitlang/moonbit-docs/issues/new?template=ice.md
Error: Moonc.Basic_hashf.Make(Key).Key_not_found(_)
Compiler args: /Users/glenn/.moon/bin/moonc link-core /Users/glenn/.moon/lib/core/_build/wasm/release/bundle/abort/abort.core /Users/glenn/.moon/lib/core/_build/wasm/release/bundle/core.core /Users/glenn/src/github.com/gmlewis/moonbit-01-base64/_build/wasm/debug/test/base64.internal_test.core -main gmlewis/base64 -o /Users/glenn/src/github.com/gmlewis/moonbit-01-base64/_build/wasm/debug/test/base64.internal_test.wasm -test-mode -pkg-config-path /Users/glenn/src/github.com/gmlewis/moonbit-01-base64/moon.pkg -pkg-sources gmlewis/base64:/Users/glenn/src/github.com/gmlewis/moonbit-01-base64 -pkg-sources moonbitlang/core:/Users/glenn/.moon/lib/core -exported_functions moonbit_test_driver_internal_execute,moonbit_test_driver_finish -target wasm -g -O0
moonc version: v0.8.2+3382e0600
         --  --
       /  //  / __--------_
      /  //  /_/            \
   ---      -                \ __
  / X        /        ____   /   )
  *_________/__/_____/______/ `--
Oops, the compiler has encountered an unexpected situation.
This is a bug in the compiler.
A bug report containing the error description and relevant code would be
greatly appreciated. You can submit the bug report here:
  https://github.com/moonbitlang/moonbit-docs/issues/new?template=ice.md
Error: Moonc.Basic_hashf.Make(Key).Key_not_found(_)
Compiler args: /Users/glenn/.moon/bin/moonc link-core /Users/glenn/.moon/lib/core/_build/wasm/release/bundle/abort/abort.core /Users/glenn/.moon/lib/core/_build/wasm/release/bundle/core.core /Users/glenn/src/github.com/gmlewis/moonbit-01-base64/_build/wasm/debug/test/base64.core /Users/glenn/src/github.com/gmlewis/moonbit-01-base64/_build/wasm/debug/test/examples/simple/simple.core /Users/glenn/src/github.com/gmlewis/moonbit-01-base64/_build/wasm/debug/test/examples/simple/simple.blackbox_test.core -main gmlewis/base64/examples/simple_blackbox_test -o /Users/glenn/src/github.com/gmlewis/moonbit-01-base64/_build/wasm/debug/test/examples/simple/simple.blackbox_test.wasm -test-mode -pkg-config-path /Users/glenn/src/github.com/gmlewis/moonbit-01-base64/examples/simple/moon.pkg -pkg-sources gmlewis/base64:/Users/glenn/src/github.com/gmlewis/moonbit-01-base64 -pkg-sources gmlewis/base64/examples/simple:/Users/glenn/src/github.com/gmlewis/moonbit-01-base64/examples/simple -pkg-sources gmlewis/base64/examples/simple_blackbox_test:/Users/glenn/src/github.com/gmlewis/moonbit-01-base64/examples/simple -pkg-sources moonbitlang/core:/Users/glenn/.moon/lib/core -exported_functions moonbit_test_driver_internal_execute,moonbit_test_driver_finish -target wasm -g -O0
moonc version: v0.8.2+3382e0600
 WARN Some diagnostics could not be rendered, please run with --no-render to see raw output.
         --  --
       /  //  / __--------_
      /  //  /_/            \
   ---      -                \ __
  / X        /        ____   /   )
  *_________/__/_____/______/ `--
Oops, the compiler has encountered an unexpected situation.
This is a bug in the compiler.
A bug report containing the error description and relevant code would be
greatly appreciated. You can submit the bug report here:
  https://github.com/moonbitlang/moonbit-docs/issues/new?template=ice.md
Error: Moonc.Basic_hashf.Make(Key).Key_not_found(_)
Compiler args: /Users/glenn/.moon/bin/moonc link-core /Users/glenn/.moon/lib/core/_build/wasm-gc/release/bundle/abort/abort.core /Users/glenn/.moon/lib/core/_build/wasm-gc/release/bundle/core.core /Users/glenn/src/github.com/gmlewis/moonbit-01-base64/_build/wasm-gc/debug/test/base64.core /Users/glenn/src/github.com/gmlewis/moonbit-01-base64/_build/wasm-gc/debug/test/base64.blackbox_test.core -main gmlewis/base64_blackbox_test -o /Users/glenn/src/github.com/gmlewis/moonbit-01-base64/_build/wasm-gc/debug/test/base64.blackbox_test.wasm -test-mode -pkg-config-path /Users/glenn/src/github.com/gmlewis/moonbit-01-base64/moon.pkg -pkg-sources gmlewis/base64:/Users/glenn/src/github.com/gmlewis/moonbit-01-base64 -pkg-sources gmlewis/base64_blackbox_test:/Users/glenn/src/github.com/gmlewis/moonbit-01-base64 -pkg-sources moonbitlang/core:/Users/glenn/.moon/lib/core -exported_functions moonbit_test_driver_internal_execute,moonbit_test_driver_finish -target wasm-gc -g -O0 -source-map
moonc version: v0.8.2+3382e0600
         --  --
       /  //  / __--------_
      /  //  /_/            \
   ---      -                \ __
  / X        /        ____   /   )
  *_________/__/_____/______/ `--
Oops, the compiler has encountered an unexpected situation.
This is a bug in the compiler.
A bug report containing the error description and relevant code would be
greatly appreciated. You can submit the bug report here:
  https://github.com/moonbitlang/moonbit-docs/issues/new?template=ice.md
Error: Moonc.Basic_hashf.Make(Key).Key_not_found(_)
Compiler args: /Users/glenn/.moon/bin/moonc link-core /Users/glenn/.moon/lib/core/_build/wasm-gc/release/bundle/abort/abort.core /Users/glenn/.moon/lib/core/_build/wasm-gc/release/bundle/core.core /Users/glenn/src/github.com/gmlewis/moonbit-01-base64/_build/wasm-gc/debug/test/base64.internal_test.core -main gmlewis/base64 -o /Users/glenn/src/github.com/gmlewis/moonbit-01-base64/_build/wasm-gc/debug/test/base64.internal_test.wasm -test-mode -pkg-config-path /Users/glenn/src/github.com/gmlewis/moonbit-01-base64/moon.pkg -pkg-sources gmlewis/base64:/Users/glenn/src/github.com/gmlewis/moonbit-01-base64 -pkg-sources moonbitlang/core:/Users/glenn/.moon/lib/core -exported_functions moonbit_test_driver_internal_execute,moonbit_test_driver_finish -target wasm-gc -g -O0 -source-map
moonc version: v0.8.2+3382e0600
         --  --
       /  //  / __--------_
      /  //  /_/            \
   ---      -                \ __
  / X        /        ____   /   )
  *_________/__/_____/______/ `--
Oops, the compiler has encountered an unexpected situation.
This is a bug in the compiler.
A bug report containing the error description and relevant code would be
greatly appreciated. You can submit the bug report here:
  https://github.com/moonbitlang/moonbit-docs/issues/new?template=ice.md
Error: Moonc.Basic_hashf.Make(Key).Key_not_found(_)
Compiler args: /Users/glenn/.moon/bin/moonc link-core /Users/glenn/.moon/lib/core/_build/wasm-gc/release/bundle/abort/abort.core /Users/glenn/.moon/lib/core/_build/wasm-gc/release/bundle/core.core /Users/glenn/src/github.com/gmlewis/moonbit-01-base64/_build/wasm-gc/debug/test/base64.core /Users/glenn/src/github.com/gmlewis/moonbit-01-base64/_build/wasm-gc/debug/test/examples/simple/simple.core /Users/glenn/src/github.com/gmlewis/moonbit-01-base64/_build/wasm-gc/debug/test/examples/simple/simple.blackbox_test.core -main gmlewis/base64/examples/simple_blackbox_test -o /Users/glenn/src/github.com/gmlewis/moonbit-01-base64/_build/wasm-gc/debug/test/examples/simple/simple.blackbox_test.wasm -test-mode -pkg-config-path /Users/glenn/src/github.com/gmlewis/moonbit-01-base64/examples/simple/moon.pkg -pkg-sources gmlewis/base64:/Users/glenn/src/github.com/gmlewis/moonbit-01-base64 -pkg-sources gmlewis/base64/examples/simple:/Users/glenn/src/github.com/gmlewis/moonbit-01-base64/examples/simple -pkg-sources gmlewis/base64/examples/simple_blackbox_test:/Users/glenn/src/github.com/gmlewis/moonbit-01-base64/examples/simple -pkg-sources moonbitlang/core:/Users/glenn/.moon/lib/core -exported_functions moonbit_test_driver_internal_execute,moonbit_test_driver_finish -target wasm-gc -g -O0 -source-map
moonc version: v0.8.2+3382e0600
 WARN Some diagnostics could not be rendered, please run with --no-render to see raw output.
         --  --
       /  //  / __--------_
      /  //  /_/            \
   ---      -                \ __
  / X        /        ____   /   )
  *_________/__/_____/______/ `--
Oops, the compiler has encountered an unexpected situation.
This is a bug in the compiler.
A bug report containing the error description and relevant code would be
greatly appreciated. You can submit the bug report here:
  https://github.com/moonbitlang/moonbit-docs/issues/new?template=ice.md
Error: Moonc.Basic_hashf.Make(Key).Key_not_found(_)
Compiler args: /Users/glenn/.moon/bin/moonc link-core /Users/glenn/.moon/lib/core/_build/js/release/bundle/abort/abort.core /Users/glenn/.moon/lib/core/_build/js/release/bundle/core.core /Users/glenn/src/github.com/gmlewis/moonbit-01-base64/_build/js/debug/test/base64.internal_test.core -main gmlewis/base64 -o /Users/glenn/src/github.com/gmlewis/moonbit-01-base64/_build/js/debug/test/base64.internal_test.js -test-mode -pkg-config-path /Users/glenn/src/github.com/gmlewis/moonbit-01-base64/moon.pkg -pkg-sources gmlewis/base64:/Users/glenn/src/github.com/gmlewis/moonbit-01-base64 -pkg-sources moonbitlang/core:/Users/glenn/.moon/lib/core -exported_functions moonbit_test_driver_internal_execute,moonbit_test_driver_finish -js-format cjs -no-dts -target js -g -O0 -source-map
moonc version: v0.8.2+3382e0600
         --  --
       /  //  / __--------_
      /  //  /_/            \
   ---      -                \ __
  / X        /        ____   /   )
  *_________/__/_____/______/ `--
Oops, the compiler has encountered an unexpected situation.
This is a bug in the compiler.
A bug report containing the error description and relevant code would be
greatly appreciated. You can submit the bug report here:
  https://github.com/moonbitlang/moonbit-docs/issues/new?template=ice.md
Error: Moonc.Basic_hashf.Make(Key).Key_not_found(_)
Compiler args: /Users/glenn/.moon/bin/moonc link-core /Users/glenn/.moon/lib/core/_build/js/release/bundle/abort/abort.core /Users/glenn/.moon/lib/core/_build/js/release/bundle/core.core /Users/glenn/src/github.com/gmlewis/moonbit-01-base64/_build/js/debug/test/base64.core /Users/glenn/src/github.com/gmlewis/moonbit-01-base64/_build/js/debug/test/base64.blackbox_test.core -main gmlewis/base64_blackbox_test -o /Users/glenn/src/github.com/gmlewis/moonbit-01-base64/_build/js/debug/test/base64.blackbox_test.js -test-mode -pkg-config-path /Users/glenn/src/github.com/gmlewis/moonbit-01-base64/moon.pkg -pkg-sources gmlewis/base64:/Users/glenn/src/github.com/gmlewis/moonbit-01-base64 -pkg-sources gmlewis/base64_blackbox_test:/Users/glenn/src/github.com/gmlewis/moonbit-01-base64 -pkg-sources moonbitlang/core:/Users/glenn/.moon/lib/core -exported_functions moonbit_test_driver_internal_execute,moonbit_test_driver_finish -js-format cjs -no-dts -target js -g -O0 -source-map
moonc version: v0.8.2+3382e0600
         --  --
       /  //  / __--------_
      /  //  /_/            \
   ---      -                \ __
  / X        /        ____   /   )
  *_________/__/_____/______/ `--
Oops, the compiler has encountered an unexpected situation.
This is a bug in the compiler.
A bug report containing the error description and relevant code would be
greatly appreciated. You can submit the bug report here:
  https://github.com/moonbitlang/moonbit-docs/issues/new?template=ice.md
Error: Moonc.Basic_hashf.Make(Key).Key_not_found(_)
Compiler args: /Users/glenn/.moon/bin/moonc link-core /Users/glenn/.moon/lib/core/_build/js/release/bundle/abort/abort.core /Users/glenn/.moon/lib/core/_build/js/release/bundle/core.core /Users/glenn/src/github.com/gmlewis/moonbit-01-base64/_build/js/debug/test/base64.core /Users/glenn/src/github.com/gmlewis/moonbit-01-base64/_build/js/debug/test/examples/simple/simple.core /Users/glenn/src/github.com/gmlewis/moonbit-01-base64/_build/js/debug/test/examples/simple/simple.blackbox_test.core -main gmlewis/base64/examples/simple_blackbox_test -o /Users/glenn/src/github.com/gmlewis/moonbit-01-base64/_build/js/debug/test/examples/simple/simple.blackbox_test.js -test-mode -pkg-config-path /Users/glenn/src/github.com/gmlewis/moonbit-01-base64/examples/simple/moon.pkg -pkg-sources gmlewis/base64:/Users/glenn/src/github.com/gmlewis/moonbit-01-base64 -pkg-sources gmlewis/base64/examples/simple:/Users/glenn/src/github.com/gmlewis/moonbit-01-base64/examples/simple -pkg-sources gmlewis/base64/examples/simple_blackbox_test:/Users/glenn/src/github.com/gmlewis/moonbit-01-base64/examples/simple -pkg-sources moonbitlang/core:/Users/glenn/.moon/lib/core -exported_functions moonbit_test_driver_internal_execute,moonbit_test_driver_finish -js-format cjs -no-dts -target js -g -O0 -source-map
moonc version: v0.8.2+3382e0600
 WARN Some diagnostics could not be rendered, please run with --no-render to see raw output.
         --  --
       /  //  / __--------_
      /  //  /_/            \
   ---      -                \ __
  / X        /        ____   /   )
  *_________/__/_____/______/ `--
Oops, the compiler has encountered an unexpected situation.
This is a bug in the compiler.
A bug report containing the error description and relevant code would be
greatly appreciated. You can submit the bug report here:
  https://github.com/moonbitlang/moonbit-docs/issues/new?template=ice.md
Error: Moonc.Basic_hashf.Make(Key).Key_not_found(_)
Compiler args: /Users/glenn/.moon/bin/moonc link-core /Users/glenn/.moon/lib/core/_build/native/release/bundle/abort/abort.core /Users/glenn/.moon/lib/core/_build/native/release/bundle/core.core /Users/glenn/src/github.com/gmlewis/moonbit-01-base64/_build/native/debug/test/base64.core /Users/glenn/src/github.com/gmlewis/moonbit-01-base64/_build/native/debug/test/base64.blackbox_test.core -main gmlewis/base64_blackbox_test -o /Users/glenn/src/github.com/gmlewis/moonbit-01-base64/_build/native/debug/test/base64.blackbox_test.c -test-mode -pkg-config-path /Users/glenn/src/github.com/gmlewis/moonbit-01-base64/moon.pkg -pkg-sources gmlewis/base64:/Users/glenn/src/github.com/gmlewis/moonbit-01-base64 -pkg-sources gmlewis/base64_blackbox_test:/Users/glenn/src/github.com/gmlewis/moonbit-01-base64 -pkg-sources moonbitlang/core:/Users/glenn/.moon/lib/core -exported_functions moonbit_test_driver_internal_execute,moonbit_test_driver_finish -target native -g -O0
moonc version: v0.8.2+3382e0600
         --  --
       /  //  / __--------_
      /  //  /_/            \
   ---      -                \ __
  / X        /        ____   /   )
  *_________/__/_____/______/ `--
Oops, the compiler has encountered an unexpected situation.
This is a bug in the compiler.
A bug report containing the error description and relevant code would be
greatly appreciated. You can submit the bug report here:
  https://github.com/moonbitlang/moonbit-docs/issues/new?template=ice.md
Error: Moonc.Basic_hashf.Make(Key).Key_not_found(_)
Compiler args: /Users/glenn/.moon/bin/moonc link-core /Users/glenn/.moon/lib/core/_build/native/release/bundle/abort/abort.core /Users/glenn/.moon/lib/core/_build/native/release/bundle/core.core /Users/glenn/src/github.com/gmlewis/moonbit-01-base64/_build/native/debug/test/base64.internal_test.core -main gmlewis/base64 -o /Users/glenn/src/github.com/gmlewis/moonbit-01-base64/_build/native/debug/test/base64.internal_test.c -test-mode -pkg-config-path /Users/glenn/src/github.com/gmlewis/moonbit-01-base64/moon.pkg -pkg-sources gmlewis/base64:/Users/glenn/src/github.com/gmlewis/moonbit-01-base64 -pkg-sources moonbitlang/core:/Users/glenn/.moon/lib/core -exported_functions moonbit_test_driver_internal_execute,moonbit_test_driver_finish -target native -g -O0
moonc version: v0.8.2+3382e0600
         --  --
       /  //  / __--------_
      /  //  /_/            \
   ---      -                \ __
  / X        /        ____   /   )
  *_________/__/_____/______/ `--
Oops, the compiler has encountered an unexpected situation.
This is a bug in the compiler.
A bug report containing the error description and relevant code would be
greatly appreciated. You can submit the bug report here:
  https://github.com/moonbitlang/moonbit-docs/issues/new?template=ice.md
Error: Moonc.Basic_hashf.Make(Key).Key_not_found(_)
Compiler args: /Users/glenn/.moon/bin/moonc link-core /Users/glenn/.moon/lib/core/_build/native/release/bundle/abort/abort.core /Users/glenn/.moon/lib/core/_build/native/release/bundle/core.core /Users/glenn/src/github.com/gmlewis/moonbit-01-base64/_build/native/debug/test/base64.core /Users/glenn/src/github.com/gmlewis/moonbit-01-base64/_build/native/debug/test/examples/simple/simple.core /Users/glenn/src/github.com/gmlewis/moonbit-01-base64/_build/native/debug/test/examples/simple/simple.blackbox_test.core -main gmlewis/base64/examples/simple_blackbox_test -o /Users/glenn/src/github.com/gmlewis/moonbit-01-base64/_build/native/debug/test/examples/simple/simple.blackbox_test.c -test-mode -pkg-config-path /Users/glenn/src/github.com/gmlewis/moonbit-01-base64/examples/simple/moon.pkg -pkg-sources gmlewis/base64:/Users/glenn/src/github.com/gmlewis/moonbit-01-base64 -pkg-sources gmlewis/base64/examples/simple:/Users/glenn/src/github.com/gmlewis/moonbit-01-base64/examples/simple -pkg-sources gmlewis/base64/examples/simple_blackbox_test:/Users/glenn/src/github.com/gmlewis/moonbit-01-base64/examples/simple -pkg-sources moonbitlang/core:/Users/glenn/.moon/lib/core -exported_functions moonbit_test_driver_internal_execute,moonbit_test_driver_finish -target native -g -O0
moonc version: v0.8.2+3382e0600
 WARN Some diagnostics could not be rendered, please run with --no-render to see raw output.

[gmlewis]

I forgot this important part:

glenn@glenn-MacM2Pro ~/src/github.com/gmlewis/moonbit-01-base64 (master) $ moon version --all
moon 0.1.20260209 (b129ae2 2026-02-09) ~/.moon/bin/moon
moonc v0.8.2+3382e0600 (2026-02-13) ~/.moon/bin/moonc
moonrun 0.1.20260209 (b129ae2 2026-02-09) ~/.moon/bin/moonrun
moon-pilot 0.0.1-df92511 (2026-02-13) ~/.moon/bin/moon-pilot

Feature flags enabled: rupes_recta,rr_moon_pkg
-> You're currently using the experimental build graph generator "Rupes Recta". If you encounter a problem, please verify whether it also reproduces with the legacy build (by setting NEW_MOON=0).

[Guest0x0]

This is actually a known issue that has been there since the big bang. moon currently does not keep track of the version of moonc in its build cache, so when moonc is updated (and nothing else is touched), the old build cache is reused. But moonc will change its internal format for serializing stuff from time to time, and an incompatible binary artifact from an older version of moonc may cause random ICE or weird behavior.

Two possible way to fix this:

• let moonc write its version hash when serializing stuff and validate the hash when deserializing stuff, and report an error on version mismatch, guiding users to manually run moon clean
• let moon keep track of the version of moonc in its build cache, and rebuild the whole world when moonc is updated

[Guest0x0]

should be fixed now