[BUG REPORT] Function definition allows non-identifiers as parameters

[Thomas Bollmeier]

Describe the bug
I am able to define a function with non-identifiers as parameters and run it successfully through the compiler. This results in invalid C code.

To Reproduce
Steps to reproduce the behavior:

1. Create a simc source file with the following content:
   `fun will_not_compile_in_c(1, 2) {
   return 42
   }

MAIN
var answer = will_not_compile_in_c(41, 1)
END_MAIN`

2. Compile it with simc

3. Inspect the generated C file.

Expected behavior
The simc compiler should disallow these kinds of function definitions.

Comment
As I have applied for the feature to add default values for parameters I hopefully can fix this bug along with the feature implementation.

[Siddhartha Dhar Choudhury]

Sure @ThomasBollmeier. Assigning this to you. Thanks @ThomasBollmeier for reporting the bug. Please also link this to #66 too. You can comment on that something like:-

Bug reported - Function definition allows non-identifiers as parameters - #204.

[Siddhartha Dhar Choudhury]

Merged, thanks for your contribution @ThomasBollmeier.