[("tests/examples/Monad11.hs:1:7: Warning: Use let\nFound:\n do x <- return $ y + z\n foo x\nWhy not:\n do let x = y + z\n foo x\n",[Replace {rtype = Stmt, pos = SrcSpan {startLine = 1, startCol = 10, endLine = 1, endCol = 29}, subts = [("lhs",SrcSpan {startLine = 1, startCol = 10, endLine = 1, endCol = 11}),("rhs",SrcSpan {startLine = 1, startCol = 24, endLine = 1, endCol = 29})], orig = "let lhs = rhs"}])]