[Issue 8120] New: std.conv.to throws exception when converting const string to int with -O optimisation switch

[d-bugmail at puremagic.com]

http://d.puremagic.com/issues/show_bug.cgi?id=8120

           Summary: std.conv.to throws exception when converting const
                    string to int with -O optimisation switch
           Product: D
           Version: D2
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: major
          Priority: P2
         Component: DMD
        AssignedTo: nobody at puremagic.com
        ReportedBy: pabuond at gmail.com


--- Comment #0 from pabuond at gmail.com 2012-05-19 06:28:24 PDT ---
Hi,
It seems code compiled by dmd with or without the optimisation 
switch -O behaves differently in this situation:

--------------------------------------------
/*
 * Compile with either
 *  dmd main.d            (won't throw exception)
 * or
 *  dmd main.d -O       (will throw exception)
 */
import std.conv;
void main()
{
    string a = "1";
    const string b = "10";

    int Na = to!int(a); // fine
    int Nb = to!int(b); // throws exception if compiled with -O
    const int constNb = to!int(b); // throws exception if compiled 
with -O
}
--------------------------------------------

A problem only occurs with the optimisation switch (-O), in which 
case an exception is thrown upon conversion of the const string 
to int (or uint; perhaps others too?). The exception thrown is:

std.conv.ConvException@/usr/local/bin/../include/dmd2/phobos/std/conv.d(1749): 
Can't convert value `10' of type string to type int
----------------
5   main                                0x000b630e int 
std.conv.toImpl!(int, 
const(immutable(char)[])).toImpl(const(immutable(char)[])) + 110
6   main                                0x000b6239 int 
std.conv.to!(int).to!(const(immutable(char)[])).to(const(immutable(char)[])) 
+ 17
7   main                                0x000b5da4 _Dmain + 64
8   main                                0x000c3ff3 extern (C) int 
rt.dmain2.main(int, char**).void runMain() + 23
9   main                                0x000c3b9d extern (C) int 
rt.dmain2.main(int, char**).void tryExec(scope void delegate()) + 
29
10  main                                0x000c4040 extern (C) int 
rt.dmain2.main(int, char**).void runAll() + 64
11  main                                0x000c3b9d extern (C) int 
rt.dmain2.main(int, char**).void tryExec(scope void delegate()) + 
29
12  main                                0x000c3b37 main + 179
13  main                                0x000b5d59 start + 53
14  ???                                 0x00000001 0x0 + 1
----------------

Thanks!

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