[Issue 7871] New: RangeViolation with findSplitBefore

[d-bugmail at puremagic.com]

http://d.puremagic.com/issues/show_bug.cgi?id=7871

           Summary: RangeViolation with findSplitBefore
           Product: D
           Version: unspecified
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: regression
          Priority: P2
         Component: DMD
        AssignedTo: nobody at puremagic.com
        ReportedBy: jmdavisProg at gmx.com


--- Comment #0 from Jonathan M Davis <jmdavisProg at gmx.com> 2012-04-09 01:27:33 PDT ---
This code works with 2.058

import std.algorithm;

void main()
{
    enum lineStart = `<bookmark href="https://`;
    string line = `<bookmark href="https://stuff">`;
    auto a = findSplitBefore(line[lineStart.length .. $], `"`)[0];
}


But with the latest head, it gives

core.exception.RangeError at q(7): Range violation
----------------
./q(_d_array_bounds+0x2a) [0x43aae6]
./q() [0x4389be]
./q(_Dmain+0x39) [0x4319c9]
./q(extern (C) int rt.dmain2.main(int, char**).void runMain()+0x17) [0x43b2ab]
./q(extern (C) int rt.dmain2.main(int, char**).void tryExec(scope void
delegate())+0x23) [0x43ac2b]
./q(extern (C) int rt.dmain2.main(int, char**).void runAll()+0x3d) [0x43b2f9]
./q(extern (C) int rt.dmain2.main(int, char**).void tryExec(scope void
delegate())+0x23) [0x43ac2b]
./q(main+0xd3) [0x43abc3]
/lib/libc.so.6(__libc_start_main+0xf5) [0x7f907bdb9455]


I'm not sure what's causing the range violation though, since it goes away in
weird ways. If you remove the [0], it works, but if I add this line after it

auto b = a[0];

it works too. If I don't slice line anymore, it also works. If I slice line
like line[0 .. $] or line[$ .. $], it also works, but anything which slices
only part of the string (instead of none of it or all of it) results in it
failing. So, I have absolutely no clue what's going on here, but clearly
something is wrong with the code being generated.

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