Features/void methods #86
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This commit makes the following code typecheck ``` def foo() : void 42 ```
With the previous commit, you could have ``` def foo() : void 42 ... 1 + foo() ``` and get an error message that only says that `+` needs numeric types. This commit adds the type of the left and right operand to the error message.
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This pull request tries to simplify the life of the programmer by allowing a body of a
void-typed method to have any type (this type is of course ignored).