re PR c++/89875 (invalid typeof reference to a member of an incomplete struct accepted at function scope)

/cp
2019-05-29  Paolo Carlini  <paolo.carlini@oracle.com>

	PR c++/89875
	* parser.c (cp_parser_sizeof_operand): When the type-id production
	did not work out commit to the tentative parse.

/testsuite
2019-05-29  Paolo Carlini  <paolo.carlini@oracle.com>

	PR c++/89875
	* g++.dg/cpp0x/decltype-pr66548.C: Remove xfail.
	* g++.dg/template/sizeof-template-argument.C: Adjust expected error.

From-SVN: r271746