The problem is that the semicolon after "let a = 3" is consumed as part
of the let-declaration.
To make sure that the semicolon is not parsed as part of the let, you
need to indent it less than the variable "a".
For example:
module Main where
main = do {
let a = 3
; return ();
};
Arthur
Why isn't this one [valid]?
module Main where
main = do {
let a = 3;
return ();
};
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