Summary: Make std.algorithm.swap weakly pure
           Product: D
           Version: D2
          Platform: All
        OS/Version: All
            Status: NEW
          Keywords: patch
          Severity: enhancement
          Priority: P2
         Component: Phobos

--- Comment #0 from 2010-10-26 12:57:01 PDT ---
This is a test program that fails with dmd 2.050alpha:

import std.algorithm: swap;
pure int foo(int x, int y) {
    swap(x, y);
    return y;
void main() {
    assert(foo(10, 20) == 10);

But swap may be modified to become weakly pure, just changing this line 1063:

void swap(T)(ref T a, ref T b) if (!is(typeof(T.init.proxySwap(T.init))))


pure void swap(T)(ref T a, ref T b) if (!is(typeof(T.init.proxySwap(T.init))))

(Probably several other functions in Phobos may now be tagged was (weakly)

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