Haskell Syntax - How to write let in bracketed do block?

Question

The following code got "parse error" on the let clause (in GHC 7.8.3):

someFunction = do {
    let foo = bar;
    return foo;
}

How to correct it in order to get the equivalent to this?

someFunction = do
    let foo = bar
    return foo

Answer 1

someFunction = do {
    let foo = bar
  ; return foo
}

or

someFunction = do {
    let { foo = bar };
    return foo
}