// called by repetitive code.  Could make a table but not worth it.

const prolog = "\n" +
	"package main\n" +
	"\n" +
	"import \"os\"\n" +
	"\n" +
	"var ok = true\n" +
	"\n" +
	"func testInt64Unary(a, plus, xor, minus int64) {\n" +
	"	if n, op, want := +a, `+`, plus; n != want { ok=false; println(`int64`, op, a, `=`, n, `should be`, want); }\n" +