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        part of compstmt handling in primary.
        (primary): Use it.  Add an error clause.
        (compstmt_nostart): Renamed from compstmt; remove all
        initial invocations of compstmt_start.
        (compstmt): New.


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@29059 138bc75d-0d04-0410-961f-82ee72b054a4