Revert "Remove superfluous impls"

Turns out ~T won't actually autoborrow to &T when casting to a trait
object. See rust-lang/rust#10347

This reverts commit c2a755d.

Author: sfackler

types/mod.rs

@@ -436,6 +436,13 @@ to_option_impl!(PgFloat4, f32)
 to_conversions_impl!(PgFloat8, f64, write_be_f64)
 to_option_impl!(PgFloat8, f64)
 
+impl ToSql for ~str {
+    fn to_sql(&self, ty: PostgresType) -> (Format, Option<~[u8]>) {
+        check_types!(PgVarchar | PgText | PgCharN, ty)
+        (Text, Some(self.as_bytes().to_owned()))
+    }
+}
+
 impl<'self> ToSql for &'self str {
     fn to_sql(&self, ty: PostgresType) -> (Format, Option<~[u8]>) {
         check_types!(PgVarchar | PgText | PgCharN, ty)
@@ -446,6 +453,13 @@ impl<'self> ToSql for &'self str {
 to_option_impl!(PgVarchar | PgText | PgCharN, ~str)
 to_option_impl!(self, PgVarchar | PgText | PgCharN, &'self str)
 
+impl ToSql for ~[u8] {
+    fn to_sql(&self, ty: PostgresType) -> (Format, Option<~[u8]>) {
+        check_types!(PgByteA, ty)
+        (Binary, Some(self.to_owned()))
+    }
+}
+
 impl<'self> ToSql for &'self [u8] {
     fn to_sql(&self, ty: PostgresType) -> (Format, Option<~[u8]>) {
         check_types!(PgByteA, ty)