+- disallow storage class specifiers in struct/union members
+- add constant folding code (optional, ast2firm already does it)
+- Refactor code, so code to handle number values (and strings?) is an own
+ module and replacable
+- Add columns to source positions
+- SourcePositions could be stored selectively on expressions that really need
+ them.
+- check semantic for functions declared/defined in global scope and declared
+ again in a local scope
+- for errors relating to function argument, print number of argument
+- print initialisation type_path for initializer errors
+
+ast2firm:
+- output source file positions for panics.
+- handle bitfield members with 0 correctly (standard says they finish the
+ current unit)
+
+Missing Errors:
+- goto over VLA declarations
+
+Missing Warnings:
+- dead assignments (int x = 5; x = bla(); -> dead assignment at x = 5;)
+- catch the if(k = b) cases, maybe require all assignments to be in parentheses
+ (but some few exceptions like toplevel, nested assignments)
+
+main/driver:
+- delete output file if we had an error