tests: Add tests for non-compliant behaviour of lexer.

tests/misc/non_compliant_lexer.py

+# lexer tests for things that are not implemented, or have non-compliant behaviour
+
+# uPy requires spaces between literal numbers and keywords, CPy doesn't
+try:
+    eval('1and 0')
+except SyntaxError:
+    print('SyntaxError')
+try:
+    eval('1or 0')
+except SyntaxError:
+    print('SyntaxError')
+try:
+    eval('1if 1else 0')
+except SyntaxError:
+    print('SyntaxError')
+try:
+    eval('1if 0else 0')
+except SyntaxError:
+    print('SyntaxError')

tests/misc/non_compliant_lexer.py.exp

+SyntaxError
+SyntaxError
+SyntaxError
+SyntaxError