[Chapel Merge] Fix lack of error for formals list starting with c

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Branch: refs/heads/master
Revision: 0fb9bc6
Author: mppf
Log Message:

Merge pull request #17607 from mppf/fix-formals-starting-comma

Fix lack of error for formals list starting with comma

A formals list starting with a comma should be a syntax error but was compiling. E.g.

proc foo(, x: int) { }

foo(1);

This PR updates the parser to make it a syntax error and adds a test for it.

  • [x] full local testing
  • [x] commit rebuilt parser

Reviewed by @lydia-duncan - thanks!

Modified Files:
A test/parsing/ferguson/formal-list-starts-comma.chpl

A test/parsing/ferguson/formal-list-starts-comma.good
M compiler/include/bison-chapel.h
M compiler/parser/bison-chapel.cpp
M compiler/parser/chapel.ypp

Compare: https://github.com/chapel-lang/chapel/compare/780594c08153...0fb9bc60c2bd