• via Digitalmars-d-bugs (44/44) Aug 27 2014 https://issues.dlang.org/show_bug.cgi?id=13382

via Digitalmars-d-bugs <digitalmars-d-bugs puremagic.com> writes:

https://issues.dlang.org/show_bug.cgi?id=13382

          Issue ID: 13382
           Summary: [e2ir] compare string to int - leads to ICE in e2ir.c
                    1902
           Product: D
           Version: D2
          Hardware: x86
                OS: Windows
            Status: NEW
          Severity: normal
          Priority: P1
         Component: DMD
          Assignee: nobody puremagic.com
          Reporter: gassa mail.ru

Reading a string from standard input and trying to compare it with an integer,
like this:
-----
if ((sn = readln ()) > 0) {}
-----
triggers an error:
-----
Internal error: e2ir.c 1902
-----

A full example follows.  It reproduces for me on DMD 2.065.0-2.066.0 on Win32. 
With 2.064.2 and earlier, I get a somewhat better "Array operation not
implemented" compiler error.  Decomposing the problematic line also gives a
normal "Incompatible types" error.
-----
import std.stdio, std.string;
void main () {
    string sn;
    if ((sn = readln ()) > 0) {
    }
}
-----

The story is that I was first reading an integer, like this:
-----
while (readf (" %s", &n) > 0) {...}
-----
and later changed reading an integer to reading a string, but forgot to fix the
exit condition.

Anyway, an internal compiler error does not specify the line of my source file,
which is inconvenient.

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