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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