H98 Report: expression syntax glitch

Consider the following Haskell 98 expressions: (let x = 10 in x `div`) (let x = 10 in x `div` 3) To parse the first, a bottom-up parser should reduce the let-expression before the operator, while to parse the second it should shift. But it needs 4 tokens of lookahead to decide which to do. That seems unreasonable, and is well beyond the LALR(1) parsers used by Hugs and GHC. Replacing `div` by + needs 2 tokens of lookahead, which is still too much. I think the first should be made illegal, but can't think of a clean rule. (There are similar expressions using lambda and if.)