$ time qmk compile -kb moonlander -km td-moon
Ψ Compiling keymap with make --jobs=1 moonlander:td-moon


QMK Firmware breakpoint_2022_05_28
Making moonlander with keymap td-moon

arm-none-eabi-gcc.exe (GCC) 12.2.0
Copyright (C) 2022 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

Size before:
   text    data     bss     dec     hex filename
      0   53288       0   53288    d028 moonlander_td-moon.bin

Compiling: quantum/keymap_introspection.c                                                          In file included from quantum/keymap_introspection.c:5:
./keyboards/moonlander/keymaps/td-moon/keymap.c: In function 'process_record_user':
./keyboards/moonlander/keymaps/td-moon/keymap.c:166:5: error: case label not within a switch statement
  166 |     case CUSTOM_ALTGR1:
      |     ^~~~
./keyboards/moonlander/keymaps/td-moon/keymap.c:179:5: error: case label not within a switch statement
  179 |     case CUSTOM_SHIFT4:
      |     ^~~~
./keyboards/moonlander/keymaps/td-moon/keymap.c:201:5: error: case label not within a switch statement
  201 |     case CUSTOM_SHIFTBKSP:
      |     ^~~~
./keyboards/moonlander/keymaps/td-moon/keymap.c:216:5: error: case label not within a switch statement
  216 |     case CUSTOM_CTRLBKSP:
      |     ^~~~
./keyboards/moonlander/keymaps/td-moon/keymap.c: At top level:
./keyboards/moonlander/keymaps/td-moon/keymap.c:241:3: error: expected identifier or '(' before 'return'
  241 |   return true;
      |   ^~~~~~
./keyboards/moonlander/keymaps/td-moon/keymap.c:242:1: error: expected identifier or '(' before '}' token
  242 | }
      | ^
 [ERRORS]
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make[1]: *** [builddefs/common_rules.mk:361: .build/obj_moonlander_td-moon/quantum/keymap_introspection.o] Error 1
Make finished with errors
make: *** [Makefile:392: moonlander:td-moon] Error 1

real    1m5.762s
user    0m0.062s
sys     0m1.390s