PR fortran/62536
	PR fortran/66175

	* decl.c (gfc_match_end): Clean up nested BLOCKs.
	* parse.c (parse_block_construct): Deal gracefully with cleaned-up
	BLOCKs.

	* gfortran.dg/block_end_error_1.f90: New test.
	* gfortran.dg/blocks_nested_incomplete_1.f90: New test.

From-SVN: r227135