[Issue 3436] New: std.functional.compose with only one function

[d-bugmail at puremagic.com]

http://d.puremagic.com/issues/show_bug.cgi?id=3436

           Summary: std.functional.compose with only one function
           Product: D
           Version: 2.035
          Platform: Other
        OS/Version: Windows
            Status: NEW
          Keywords: patch
          Severity: minor
          Priority: P2
         Component: Phobos
        AssignedTo: nobody at puremagic.com
        ReportedBy: dsimcha at yahoo.com


--- Comment #0 from David Simcha <dsimcha at yahoo.com> 2009-10-22 12:14:50 PDT ---
import std.functional, std.math;

alias compose!(sqrt) myCompose;


C:\dmd2\windows\bin\..\..\src\phobos\std\functional.d(474): Error: tuple index
0 exceeds 0

Only happens in the degenerate case of only passing one function to compose. 
Not a terribly severe bug, but might be annoying in some metaprogramming cases,
and should ideally be fixed anyhow.

Fix:  Around line 454, check for this as a special case.

static if(fun.length == 1) {
    alias fun[0] doIt;
} else static if (fun.length == 2) {

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