[dmd-beta] D 1.074 and 2.059 betas 2

[Nick Sabalausky]

While the test case for #7826 now works, for some reason I'm still getting 
the same warning in my own projects (but without "pure" being included in 
"must be declared as...") even though they which use the *exact* same toHash 
function (well, except "str" having a different name). I'll try to figure 
out a new test case after I get some sleep...