[Issue 8729] New: parse!bool does not work correctly

[d-bugmail at puremagic.com]

http://d.puremagic.com/issues/show_bug.cgi?id=8729

           Summary: parse!bool does not work correctly
           Product: D
           Version: unspecified
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: P2
         Component: Phobos
        AssignedTo: nobody at puremagic.com
        ReportedBy: jmdavisProg at gmx.com


--- Comment #0 from Jonathan M Davis <jmdavisProg at gmx.com> 2012-09-26 10:29:46 PDT ---
This code

import std.conv;
import std.stdio;

void main()
{
    auto str = "123 456.7 false";

    auto i = parse!int(str);
    auto d = parse!double(str);
    auto b = parse!bool(str);

    assert(i == 123);
    assert(d == 456.7);
    assert(b == false);
}

results in this exception when you run it

std.conv.ConvException at std/conv.d(2654): Can't parse string: bool should be
case-insensive 'true' or 'false'
----------------
./q(bool std.conv.parse!(bool, immutable(char)[]).parse(ref
immutable(char)[])+0x183) [0x43867b]
./q(_Dmain+0x42) [0x430ec2]
./q(extern (C) int rt.dmain2.main(int, char**).void runMain()+0x1c) [0x43b240]
./q(extern (C) int rt.dmain2.main(int, char**).void tryExec(scope void
delegate())+0x2a) [0x43abba]
./q(extern (C) int rt.dmain2.main(int, char**).void runAll()+0x3b) [0x43b287]
./q(extern (C) int rt.dmain2.main(int, char**).void tryExec(scope void
delegate())+0x2a) [0x43abba]
./q(main+0xd1) [0x43ab45]
/usr/lib/libc.so.6(__libc_start_main+0xf5) [0x7fd238fc1725]
----------------

If you change it to

import std.conv;
import std.stdio;

void main()
{
    auto str = "false 123 456.7";

    auto b = parse!bool(str);
    auto i = parse!int(str);
    auto d = parse!double(str);

    assert(i == 123);
    assert(d == 456.7);
    assert(b == false);
}

you get

std.conv.ConvException at std/conv.d(1771): Unexpected ' ' when converting from
type string to type int
----------------
./q(int std.conv.parse!(int, immutable(char)[]).parse(ref
immutable(char)[])+0x1b8) [0x431984]
./q(_Dmain+0x33) [0x430eb3]
./q(extern (C) int rt.dmain2.main(int, char**).void runMain()+0x1c) [0x43b240]
./q(extern (C) int rt.dmain2.main(int, char**).void tryExec(scope void
delegate())+0x2a) [0x43abba]
./q(extern (C) int rt.dmain2.main(int, char**).void runAll()+0x3b) [0x43b287]
./q(extern (C) int rt.dmain2.main(int, char**).void tryExec(scope void
delegate())+0x2a) [0x43abba]
./q(main+0xd1) [0x43ab45]
/usr/lib/libc.so.6(__libc_start_main+0xf5) [0x7f1286cc0725]
----------------

Just parsing out bool when it's first and then parsing _nothing_ else works,
but it seems like parsing it under any other circumstances fails (from what I
can tell anyway).

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