The TypeCheckExpr creates a new TyTy::BoolType for a
ComparisonExpr. This new BoolType is unknown to TyTyResolveCompile
which causes a crash when trying to compile the inferred new
BoolType. The new "bools_eq.rs" testcase uses several bools which show
this issue. Resolve this by looking up the buil
An if conditional expression doesn't need brackets, but that means
that it doesn't accept struct expressions. Those are not easy to
distinquish from the block that follows. What isn't immediately clear
from the grammar is that unary conditions like minus '-' or not '!'
also shouldn't accept struct