* libguile/eval.c (scm_m_cont, scm_m_at_call_with_values,

	* libguile/eval.c (scm_m_cont, scm_m_at_call_with_values,
	scm_m_generalized_set_x): Use ASSERT_SYNTAX to signal syntax
	errors.  Avoid unnecessary consing when creating the memoized
	code.

	(scm_m_generalized_set_x): Let scm_m_set_x handle the R5RS
	standard case.  Make sure line and file information are copied to
	every created expression.

	* test-suite/tests/syntax.test (exception:bad-var): Removed.

	Adapted tests for 'set!' to the new way of error reporting.