* test/expressions/alternative_tokens-01.cc,
	* test/expressions/alternative_tokens-02.cc,
	* test/expressions/alternative_tokens-03.cc: Add new tests.
	* test/expressions/Makefile.am: Add the new tests.
	* test/g++/Makefile.am: Update fail-tests list.

	* src/syn/InclusiveOrExpressions.sdf,
	* src/syn/ExclusiveOrExpressions.sdf,
	* src/syn/AndExpressions.sdf,
	* src/syn/AssignmentExpressions.sdf,
	* src/syn/LogicalOrExpressions.sdf,
	* src/syn/LogicalAndExpressions.sdf,
	* src/syn/OperatorFunctionIds.sdf,
	* src/syn/UnaryExpressions.sdf: Add "alternative tokens".