[allow non-indenting 'then' statements too
John Meacham <john@repetae.net>**20051208010910] hunk ./FrontEnd/HsParser.ly 534
->	| 'if' exp 'then' exp optsemi 'else' exp { HsIf $2 $4 $7 }
+>	| 'if' exp optsemi 'then' exp optsemi 'else' exp { HsIf $2 $5 $8 }