new error message in 2.066, type bool (const)

[Paul D Anderson via Digitalmars-d-learn]

Re-compiling existing code with version 2.066 generates a lot of 
errors complaining about implicit conversion to const. Typical is 
this call (inside a struct with properties 1 & 2):

	z.sign = x.sign ^ y.sign;

Error: None of the overloads of 'sign' are callable using 
argument types bool (const), candidates are:

1)	@property
	@safe
	bool sign() const
	{
		return signed;
	}

2)	@property
	@safe
	bool sign(in bool value)
	{
		signed = value;
		return signed;
	}

What changed? It ran okay with early beta versions, but not with 
the release.

Paul