Fix Trac #10004: head [] exception when using recursive mdo
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- compiler/rename/RnExpr.hs 29 additions, 24 deletionscompiler/rename/RnExpr.hs
- testsuite/tests/mdo/should_compile/T10004.hs 6 additions, 0 deletionstestsuite/tests/mdo/should_compile/T10004.hs
- testsuite/tests/mdo/should_compile/all.T 2 additions, 0 deletionstestsuite/tests/mdo/should_compile/all.T
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