[("tests/examples/Monad10.hs:1:7: Warning: Use let\nFound:\n  do x <- return y\n     foo x\nWhy not:\n  do let x = y\n     foo x\n",[Replace {rtype = Stmt, pos = SrcSpan {startLine = 1, startCol = 10, endLine = 1, endCol = 23}, subts = [("lhs",SrcSpan {startLine = 1, startCol = 10, endLine = 1, endCol = 11}),("rhs",SrcSpan {startLine = 1, startCol = 22, endLine = 1, endCol = 23})], orig = "let lhs = rhs"}])]