Remove vtab() function from VTabCursor trait

src/vtab/array.rs

@@ -126,9 +126,6 @@ impl ArrayTabCursor {
 impl VTabCursor for ArrayTabCursor {
     type Table = ArrayTab;
 
-    fn vtab(&self) -> &ArrayTab {
-        unsafe { &*(self.base.pVtab as *const ArrayTab) }
-    }
     fn filter(&mut self, idx_num: c_int, _idx_str: Option<&str>, args: &Values) -> Result<()> {
         if idx_num > 0 {
             self.ptr = try!(args.get_array(0));

src/vtab/csvtab.rs

@@ -272,15 +272,16 @@ impl CSVTabCursor {
             eof: false,
         }
     }
+
+    /// Accessor to the associated virtual table.
+    fn vtab(&self) -> &CSVTab {
+        unsafe { &*(self.base.pVtab as *const CSVTab) }
+    }
 }
 
 impl VTabCursor for CSVTabCursor {
     type Table = CSVTab;
 
-    fn vtab(&self) -> &CSVTab {
-        unsafe { &*(self.base.pVtab as *const CSVTab) }
-    }
-
     // Only a full table scan is supported.  So `filter` simply rewinds to
     // the beginning.
     fn filter(&mut self, _idx_num: c_int, _idx_str: Option<&str>, _args: &Values) -> Result<()> {

src/vtab/mod.rs

@@ -324,8 +324,6 @@ impl<'a> OrderBy<'a> {
 /// Virtual table cursor trait.
 pub trait VTabCursor: Sized {
     type Table: VTab;
-    /// Accessor to the associated virtual table.
-    fn vtab(&self) -> &Self::Table;
     /// Begin a search of a virtual table.
     fn filter(&mut self, idx_num: c_int, idx_str: Option<&str>, args: &Values) -> Result<()>;
     /// Advance cursor to the next row of a result set initiated by `filter`.

src/vtab/series.rs

@@ -182,9 +182,6 @@ impl SeriesTabCursor {
 impl VTabCursor for SeriesTabCursor {
     type Table = SeriesTab;
 
-    fn vtab(&self) -> &SeriesTab {
-        unsafe { &*(self.base.pVtab as *const SeriesTab) }
-    }
     fn filter(&mut self, idx_num: c_int, _idx_str: Option<&str>, args: &Values) -> Result<()> {
         let idx_num = QueryPlanFlags::from_bits_truncate(idx_num);
         let mut i = 0;

tests/vtab.rs

@@ -57,9 +57,6 @@ fn test_dummy_module() {
     impl VTabCursor for DummyTabCursor {
         type Table = DummyTab;
 
-        fn vtab(&self) -> &DummyTab {
-            unsafe { &*(self.base.pVtab as *const DummyTab) }
-        }
         fn filter(
             &mut self,
             _idx_num: c_int,