The NodeRegion is an extended form of LabRegion (which is smaller) and
has the same layout. So we cast into the smaller type.
ExtBasic.c:1025:31: warning: incompatible pointer types passing 'NodeRegion *' (aka 'struct nreg *') to parameter of type 'LabRegion *' (aka 'struct lreg *')
ExtBasic.c:2291:29: warning: incompatible pointer types passing 'NodeRegion *' (aka 'struct nreg *') to parameter of type 'LabRegion *' (aka 'struct lreg *')
ExtBasic.c:2335:46: warning: incompatible pointer types passing 'NodeRegion *' (aka 'struct nreg *') to parameter of type 'LabRegion *' (aka 'struct lreg *')
ExtBasic.c:2339:47: warning: incompatible pointer types passing 'NodeRegion *' (aka 'struct nreg *') to parameter of type 'LabRegion *' (aka 'struct lreg *')
clang18 default warning cleanup [-Wincompatible-pointer-types]
165f1b35b4