I've accidentally written "float a<x><y>" where I meant "float a<x,y>"
With v0.5_beta1 this gives:
brcc: brtdecl.cpp:46: BrtStreamType::BrtStreamType(const ArrayType*): Assertion `p->subType->isBaseType()' failed.
with no indication of where in my source code the error is. It would be nice, if the error message was more helpful.