Add test for infix function definitions

testsuite/tests/ghc-regress/rename/should_fail/all.T

@@ -46,3 +46,4 @@ test('rnfail042', normal, compile_fail, [''])
 
 test('rnfail043', skip_if_no_ghci, compile_fail, [''])
 test('rnfail044', normal, compile_fail, [''])
+test('rnfail045', normal, compile_fail, [''])

testsuite/tests/ghc-regress/rename/should_fail/rnfail045.hs

+-- These crashed GHC 6.4.2
+
+module ShouldFail where
+
+x `op1` y = True
+op1 x = False
+
+op2 x = False
+x `op2` y = True

testsuite/tests/ghc-regress/rename/should_fail/rnfail045.stderr

+
+rnfail045.hs:5:0:
+    Equations for `op1' have different numbers of arguments
+      rnfail045.hs:5:0-15
+      rnfail045.hs:6:0-12
+
+rnfail045.hs:8:0:
+    Equations for `op2' have different numbers of arguments
+      rnfail045.hs:8:0-12
+      rnfail045.hs:9:0-15