Bug 3844 – Require opEquals/opCmp in a class the defines toHash

This code compiles and runs: class Foo { int a, b; override hash_t toHash() { return a + b; } this(int aa, int bb) { this.a = aa; this.b = bb; } } void main() { int[Foo] aa1; aa1[new Foo(1, 2)] = 10; } I think in a class it's not that useful to define toHash and not define opEquals/opCmp too. So when a toHash is defined, the compiler can raise a warning to require the definition of an opEquals/opCmp too.

See also bug 4290