Using Visual Studio 2022 (17.11.5) I get the following build error. If I undo that commit it builds fine.
CXX build/host/mrbc/mrbgems/mruby-compiler/core/y.tab-cxx.cxx -> build/host/mrbc/mrbgems/mruby-compiler/core/y.tab-cxx.obj
y.tab-cxx.cxx
C:/james_projects/GitHub/mruby_fork/mrbgems/mruby-compiler/core/y.tab.c(6364): warning C4065: switch statement contains 'default' but no 'case' labels
C:/james_projects/GitHub/mruby_fork/mrbgems/mruby-compiler/core/y.tab.c(6524): error C2440: 'static_cast': cannot convert from 'unsigned int' to 'yyalloc *'
C:/james_projects/GitHub/mruby_fork/mrbgems/mruby-compiler/core/y.tab.c(6524): note: Conversion from integral type to pointer type requires reinterpret_cast, C-style cast or parenthesized function-style cast
C:/james_projects/GitHub/mruby_fork/mrbgems/mruby-compiler/core/y.tab.c(10760): error C2440: 'static_cast': cannot convert from 'unsigned int' to 'char *'
C:/james_projects/GitHub/mruby_fork/mrbgems/mruby-compiler/core/y.tab.c(10760): note: Conversion from integral type to pointer type requires reinterpret_cast, C-style cast or parenthesized function-style cast
mrbgems/mruby-compiler/core/keywords(58): warning C4267: 'initializing': conversion from 'size_t' to 'unsigned int', possible loss of data
rake aborted!