question: returns the first unit in this block . concode_field_sep Body mBody concode_elem_sep int mBlockLength concode_elem_sep int mIndexInMethod concode_elem_sep List<Block> mPreds concode_elem_sep Unit mTail concode_elem_sep List<Block> mSuccessors concode_elem_sep Unit mHead concode_field_sep int getIndexInMethod concode_elem_sep List<Block> getPreds concode_elem_sep Unit getTail concode_elem_sep Body getBody concode_elem_sep Unit getPredOf concode_elem_sep void setIndexInMethod concode_elem_sep void insertAfter concode_elem_sep boolean remove concode_elem_sep void insertBefore concode_elem_sep Iterator<Unit> iterator concode_elem_sep String toShortString concode_elem_sep List<Block> getSuccs concode_elem_sep void setSuccs concode_elem_sep String toString concode_elem_sep void setPreds concode_elem_sep Unit getSuccOf
target: Unit function ( ) { return mHead ; }