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From: "admin@tho-otto.de" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug modula2/110246] New: Using variables of type CHAR or BYTE as
 array index does not work
Date: Wed, 14 Jun 2023 05:11:25 +0000
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X-Bugzilla-Product: gcc
X-Bugzilla-Component: modula2
X-Bugzilla-Version: 13.1.0
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X-Bugzilla-Severity: normal
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D110246

            Bug ID: 110246
           Summary: Using variables of type CHAR or BYTE as array index
                    does not work
           Product: gcc
           Version: 13.1.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: modula2
          Assignee: gaius at gcc dot gnu.org
          Reporter: admin@tho-otto.de
  Target Milestone: ---

In the following example:

IMPLEMENTATION MODULE foo;

FROM SYSTEM IMPORT BYTE;

VAR arr: ARRAY['A'..'Z'] OF INTEGER;
VAR ch: CHAR;

BEGIN
  FOR ch :=3D 'A' TO 'Z' DO arr[ch] :=3D 0 END;
END foo.

I get error messages:

/usr/lib64/gcc/x86_64-suse-linux/13/m2/m2pim/COROUTINES.def:37:1: error: ty=
pe
incompatibility, attempting to use a string ('_T38') when a CHAR is expected
/usr/lib64/gcc/x86_64-suse-linux/13/m2/m2pim/COROUTINES.def:37:1: error: ty=
pe
incompatibility, attempting to use a string ('_T38') when a CHAR is expected
/usr/lib64/gcc/x86_64-suse-linux/13/m2/m2pim/COROUTINES.def:37:1: error: ty=
pe
incompatibility, attempting to use a string ('_T38') when a CHAR is expected
/usr/lib64/gcc/x86_64-suse-linux/13/m2/m2pim/COROUTINES.def:37:1: error: ty=
pe
incompatibility, attempting to use a string ('_T38') when a CHAR is expected

(note also the totally unrelated source line in the error message)

Changing the type of ch to BYTE i get instead:

/usr/lib64/gcc/x86_64-suse-linux/13/m2/m2pim/COROUTINES.def:37:1: error: le=
ft
operand =E2=80=98ch=E2=80=99 of type =E2=80=98BYTE=E2=80=99 is not allowed =
in binary expression +=