In the amalgamation sqlite3VdbeGetLast Op is declared with:

SQLITE_PRIVATE VdbeOp sqlite3VdbeGetLastOp(Vdbe);

Then implemented without the SQLITE_PRIVATE with:

VdbeOp * sqlite3VdbeGetLastOp(Vdbe *p){ return sqlite3VdbeGetOp(p, p->nOp - 1); }