If stevefan1999's referring to a nasty frontend issue, it might be due to the fact that a name introduced by a typedef and an identical identifier can mingle in

If stevefan1999's referring to a nasty frontend issue, it might be due to the fact that a name introduced by a typedef and an identical identifier can mingle in the same scope, which makes parsing pretty nasty – e.g. (example from source at end): typedef int AA; void foo() { AA AA; /\* OK - define variable AA of type AA */ int BB = AA * 2; /\* OK - AA is just a variable name here \*/ } void bar() { int aa = sizeof(AA), AA, bb = sizeof(AA); } https://eli.thegreenplace.net/2011/05/02/the-context-sensitivity-of-cs-grammar-revisited https://eli.thegreenplace.net/2011/05/02/the-context-sensiti... I don't know off the top of my head whether there's a parser framework that makes this parse "straightforward" to express.