Uncaught exceptions when using maps of tuples

[fubuloubu]

Version Information

• vyper Version (output of vyper --version): 0.1.0b9
• OS: linux
• Python Version (output of python --version): Python 3.6.6
• Environment (output of pip freeze):

flake8==3.5.0
mccabe==0.6.1
pycodestyle==2.3.1
pycryptodome==3.6.6
pyflakes==1.6.0

What's your issue about?

I got some uncaught exceptions when trying to work with maps of tuples:

foo: map(uint256, (uint256, uint256))  # Works fine by itself

@public
def bar1(_t: uint256):
    assert self.foo[_t] == (0, 0)
    # AttributeError: 'TupleType' object has no attribute 'unit'

@public
def bar2(_t: uint256):
    self.foo[_t] = (1, 1)
    # UnboundLocalError: local variable 'subtype' referenced before assignment

@public
@constant
def baz(_t: uint256) -> (uint256, uint256):
    return self.foo[_t]
    # UnboundLocalError: local variable 'subtype' referenced before assignment

How can it be fixed?

Could be related to #1431.

[jacqueswww]

Same as in #1431 we don't support tuples as data types. And I don't think we should.

[fubuloubu]

Resolution is the same as it is in #1431 then: make it clearer that Tuples are not supported up front.

[iamdefinitelyahuman]

Fixed by #2029