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- Every call through gBackendFunctionsTable.GL in the seven MG_Impl TUs (Drawing 36, Framebuffer 11, Texture 8, Getter 3, Program 1, Query 18, Sync 6) is preceded by MGP_FILL(<Verb>); placed after every early return the call sits behind - the conditional-render check, the null-entry guards, the loop bodies - so a verb whose entry is null on this backend never bumps the serial. - Seven calls sit on a continuation line of a guarded expression (GetQueryResult64 x2, BeginXfbPrimitivesQuery, BeginTimeElapsedQuery, QueryCounterTimestamp, IsTimerQuerySupported, GetSyncStatus) and two more fold the null guard into the same expression (IsQueryResultAvailable, ClientWaitSync's guarded return); there the fill precedes the statement, so a null entry bumps the serial once with nothing to read it - harmless for the poison, recorded for the record. - Each TU includes <MG_Impl/Pipe/PipeFill.h> after its last MG_State/MG_Backend include; under MOBILEGL_PIPE_PUSH=OFF the macro is ((void)0) and the pull library is symbol-identical with a .text delta of zero.