Bug 4184 – associative array with certain key types results in corrupt values during iteration

The following code: import std.stdio; void main() { uint[ushort] aa; aa[1] = 1; aa[2] = 2; aa[3] = 3; aa[4] = 4; aa[5] = 5; writefln("%s", aa); foreach(ushort k, uint v; aa) { writefln("%s => %s", k, v); } } results in the following output: [4:4,1:1,5:5,2:2,3:3] 4 => 262144 1 => 65536 5 => 327680 2 => 131072 3 => 196608 Clearly, the data is stored correctly, or else writefln would not be able to get the correct values when displaying the AA directly. However, the iteration code is getting corrupt values. I suspect this is probably a druntime issue. It was introduced somewhere between 2.033 (which works) and 2.036 (I haven't yet downloaded the intermediate versions). I will see if I can find the cause and commit a patch.

wow, nevermind, it is probably dmd. Compiling this simple function results in pages and pages of AA functions in disassembly, I'm not sure if druntime has anything to do with this bug. void foo(uint[ushort] aa) { foreach(ushort k, uint v; aa) { } }

Printing things in hex yields 40000, 10000, 50000, 20000, 30000. Hmm.

changeset 295

Great, thanks! No wonder there was so much code generated, it's a template :) I didn't know the compiler associated AA's with a template. I'll test against dcollections tomorrow.

I confirm, it fixes the problems in dcollections, thanks.

*** Issue 4209 has been marked as a duplicate of this issue. ***