Remove find_col_named

It's a very simple utility function that won't be used enough to keep it
on a trait like PostgresStatement.

lib.rs

@@ -926,14 +926,6 @@ pub trait PostgresStatement {
             Err(err) => fail!("Error executing query:\n{}", err.to_str())
         }
     }
-
-    /// Returns the index of the first result column with the specified name,
-    /// or `None` if not found.
-    fn find_col_named(&self, col: &str) -> Option<uint> {
-        do self.result_descriptions().iter().position |desc| {
-            desc.name.as_slice() == col
-        }
-    }
 }
 
 /// A statement prepared outside of a transaction.
@@ -1296,9 +1288,11 @@ impl RowIndex for int {
 impl<'self> RowIndex for &'self str {
     #[inline]
     fn idx(&self, stmt: &NormalPostgresStatement) -> uint {
-        match stmt.find_col_named(*self) {
-            Some(idx) => idx,
-            None => fail!("No column with name {}", *self)
+        for (i, desc) in stmt.result_descriptions().iter().enumerate() {
+            if desc.name.as_slice() == *self {
+                return i;
+            }
         }
+        fail!("There is no colnum with name {}", *self);
     }
 }

test.rs

@@ -459,15 +459,6 @@ fn test_too_many_params() {
                                                 &3i32 as &ToSql]);
 }
 
-#[test]
-fn test_find_col_named() {
-    let conn = PostgresConnection::connect("postgres://postgres@localhost");
-    let stmt = conn.prepare("SELECT 1 as my_id, 'hi' as val");
-    assert_eq!(Some(0), stmt.find_col_named("my_id"));
-    assert_eq!(Some(1), stmt.find_col_named("val"));
-    assert_eq!(None, stmt.find_col_named("asdf"));
-}
-
 #[test]
 fn test_get_named() {
     let conn = PostgresConnection::connect("postgres://postgres@localhost");