unuesd constructor value yields opaque errors

[Hjagu]

The easiest way to describe this is just with some example code:

struct foo:
	bar: int
constructor foo(bar: int = 1):
	return foo{bar}

def baz():
	return foo(5)

baz()

output

constructor.lobster(4): error: constructor must return value of its own type
  in constructor.lobster(7): foo(bar:int)
  in constructor.lobster(9): baz()

---

working code

struct foo:
	bar: int
constructor foo(bar: int = 1):
	return foo{bar}

def baz():
	return foo(5)

print baz()

output

foo{5}

expected output

i would like the newly constructed value to be discarded as if i called a function (aka the first example outputs nothing), like what this code does

struct foo:
	bar: int
constructor foo(bar: int = 1):
	return foo{bar}

def baz():
	return foo(5)

let _ = baz()

output

[Wouter van Oortmerssen]

Yeah, it specializes the constructor to return void in this case :)

Fixed here: 3f1ad74