On Monday, 23 May 2016 at 08:59:31 UTC, moechofe wrote:
    void delegate(string source,string dest) handler;

    if(use_symlink) handler = delegate(string s,string d){
        symlink(s,d);
    }; else handler = delegate(string s,string d){
        copy(s,d);
    };

Boy that's a confusing way to write that. Here's a clearer version

if(use_symlink)
    handler = delegate(string s,string d){ symlink(s,d); };
else
    handler = delegate(string s,string d){ copy(s,d); };

What did I do wrong?

Sounds like a data race problem. Use a lock on the file write operation and see if that helps.

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