A reason for this behaviour is that if there is no `result` nor `return`, the
last expression of the proc will be used. I can't find in the manual where it
is documented but the following code compiles:
proc foo: int =
2
echo foo()
Run
My understanding is that Nim uses these 3 different proc result syntaxes for
different reasons:
* `return` allows breaking out of proc à la C and is like a goto end
statement. Some would see it like an optimization and it can make code
verification more difficult.
* `result` comes from the Oberon or Eiffel heritage. An interesting fact of
having the result in a variable is that the compiler could reason on the state
of the variable (i.e. value has changed).
* And the last expression value is the functional way.
But yes, useful warnings would help writing safer code.
