AA: How to lose a class

[David]

http://dpaste.dzfl.pl/9172bed3

If mutable keys are allowed in AAs, then why don't they work and why
isn't that documentated? The docs imply this should work, but it
obviously doesn't.

Code:


import std.stdio;

@trusted nothrow void printHash(hash_t h) {
	try { writefln("Called hashing func: %s", h); } catch(Exception e) {}
}

class Key{
	hash_t hash;
	
	this(size_t hash) {
		this.hash = hash;
	}
	
	override hash_t toHash() const {
		printHash(this.hash);
		return hash;
	}
	
	override bool opEquals(Object o) const {
		Key k = cast(Key)o;
		if(k is null) {
			return false;
		}
		
		return hash == k.hash;
	}
	
	override int opCmp(Object o) const {
		Key k = cast(Key)o;
		if(k is null) {
			return -1;
		}
		
		if(k.hash < hash) {
			return -1;
		} else if(k.hash == hash) {
			return 0;
		} else {
			return 1;
		}
	}
}

void main() {
	int[Key] aa;
	
	Key k1 = new Key(10);

	aa[k1] = 3;
	writeln(aa[new Key(10)]);	
	
	k1.hash = 5;
	writeln((new Key(5)) in aa);
	writeln((new Key(10)) in aa);	
	writeln(k1 in aa);
	
}