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From: "pinskia at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c/103679] New: ICE after error on nested function with VLA as
 argument
Date: Mon, 13 Dec 2021 04:29:18 +0000
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X-Bugzilla-Component: c
X-Bugzilla-Version: 12.0
X-Bugzilla-Keywords: error-recovery, ice-on-invalid-code
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D103679

            Bug ID: 103679
           Summary: ICE after error on nested function with VLA as
                    argument
           Product: gcc
           Version: 12.0
            Status: UNCONFIRMED
          Keywords: error-recovery, ice-on-invalid-code
          Severity: normal
          Priority: P3
         Component: c
          Assignee: unassigned at gcc dot gnu.org
          Reporter: pinskia at gcc dot gnu.org
  Target Milestone: ---

Take:

void fn1 ()
{
void fnx ()
  int n;
  int a[n];
}

---- CUT ---
We currently have error messages and then some ICEs:
<source>: In function 'fnx':
<source>:7:1: error: expected declaration specifiers before '}' token
    7 | }
      | ^
<source>:6:7: error: declaration for parameter 'a' but no such parameter
    6 |   int a[n];
      |       ^
<source>:5:7: error: declaration for parameter 'n' but no such parameter
    5 |   int n;
      |       ^
<source>:8: error: expected '{' at end of input
<source>: In function 'fn1':
<source>:7:1: error: expected declaration or statement at end of input
    7 | }
      | ^
<source>:2:6: internal compiler error: n from fnx referenced in fn1
    2 | void fn1 ()
      |      ^~~=