diff --git a/codegen/src/main.rs b/codegen/src/main.rs
index 0ab7eab1..293686cb 100644
--- a/codegen/src/main.rs
+++ b/codegen/src/main.rs
@@ -9,7 +9,7 @@ mod sqlstate;
 mod type_gen;
 
 fn main() {
-    let path = Path::new("../src");
+    let path = Path::new("..");
     sqlstate::build(path);
     type_gen::build(path);
 }
diff --git a/codegen/src/sqlstate.rs b/codegen/src/sqlstate.rs
index 03bffaf9..94f37ae0 100644
--- a/codegen/src/sqlstate.rs
+++ b/codegen/src/sqlstate.rs
@@ -13,7 +13,7 @@ struct Code {
 }
 
 pub fn build(path: &Path) {
-    let mut file = BufWriter::new(File::create(path.join("error/sqlstate.rs")).unwrap());
+    let mut file = BufWriter::new(File::create(path.join("postgres-shared/src/error/sqlstate.rs")).unwrap());
 
     let codes = parse_codes();
 
diff --git a/codegen/src/type_gen.rs b/codegen/src/type_gen.rs
index 49607538..034b4e3a 100644
--- a/codegen/src/type_gen.rs
+++ b/codegen/src/type_gen.rs
@@ -20,7 +20,7 @@ struct Type {
 }
 
 pub fn build(path: &Path) {
-    let mut file = BufWriter::new(File::create(path.join("types/type_gen.rs")).unwrap());
+    let mut file = BufWriter::new(File::create(path.join("postgres/src/types/type_gen.rs")).unwrap());
 
     let ranges = parse_ranges();
     let types = parse_types(&ranges);
diff --git a/postgres-shared/Cargo.toml b/postgres-shared/Cargo.toml
index 80e16b7c..8c433c73 100644
--- a/postgres-shared/Cargo.toml
+++ b/postgres-shared/Cargo.toml
@@ -5,3 +5,6 @@ authors = ["Steven Fackler <sfackler@gmail.com>"]
 
 [dependencies]
 hex = "0.2"
+fallible-iterator = "0.1.3"
+phf = "=0.7.20"
+postgres-protocol = "0.2"
diff --git a/postgres/src/error/mod.rs b/postgres-shared/src/error/mod.rs
similarity index 84%
rename from postgres/src/error/mod.rs
rename to postgres-shared/src/error/mod.rs
index 94105221..f96ff5a9 100644
--- a/postgres/src/error/mod.rs
+++ b/postgres-shared/src/error/mod.rs
@@ -6,10 +6,8 @@ use std::error;
 use std::convert::From;
 use std::fmt;
 use std::io;
-use std::result;
 
 pub use self::sqlstate::SqlState;
-use {Result, DbErrorNew};
 
 mod sqlstate;
 
@@ -141,8 +139,9 @@ pub struct DbError {
     _p: (),
 }
 
-impl DbErrorNew for DbError {
-    fn new_raw(fields: &mut ErrorFields) -> io::Result<DbError> {
+impl DbError {
+    #[doc(hidden)]
+    pub fn new_raw(fields: &mut ErrorFields) -> io::Result<DbError> {
         let mut severity = None;
         let mut parsed_severity = None;
         let mut code = None;
@@ -169,8 +168,18 @@ impl DbErrorNew for DbError {
                 b'M' => message = Some(field.value().to_owned()),
                 b'D' => detail = Some(field.value().to_owned()),
                 b'H' => hint = Some(field.value().to_owned()),
-                b'P' => normal_position = Some(try!(field.value().parse::<u32>().map_err(|_| ::bad_response()))),
-                b'p' => internal_position = Some(try!(field.value().parse::<u32>().map_err(|_| ::bad_response()))),
+                b'P' => {
+                    normal_position = Some(try!(field.value().parse::<u32>().map_err(|_| {
+                        io::Error::new(io::ErrorKind::InvalidInput,
+                                       "`P` field did not contain an integer")
+                    })));
+                }
+                b'p' => {
+                    internal_position = Some(try!(field.value().parse::<u32>().map_err(|_| {
+                        io::Error::new(io::ErrorKind::InvalidInput,
+                                       "`p` field did not contain an integer")
+                    })));
+                }
                 b'q' => internal_query = Some(field.value().to_owned()),
                 b'W' => where_ = Some(field.value().to_owned()),
                 b's' => schema = Some(field.value().to_owned()),
@@ -179,18 +188,32 @@ impl DbErrorNew for DbError {
                 b'd' => datatype = Some(field.value().to_owned()),
                 b'n' => constraint = Some(field.value().to_owned()),
                 b'F' => file = Some(field.value().to_owned()),
-                b'L' => line = Some(try!(field.value().parse::<u32>().map_err(|_| ::bad_response()))),
+                b'L' => {
+                    line = Some(try!(field.value().parse::<u32>().map_err(|_| {
+                        io::Error::new(io::ErrorKind::InvalidInput,
+                                       "`L` field did not contain an integer")
+                    })));
+                }
                 b'R' => routine = Some(field.value().to_owned()),
-                b'V' => parsed_severity = Some(try!(Severity::from_str(field.value()).ok_or_else(::bad_response))),
+                b'V' => {
+                    parsed_severity = Some(try!(Severity::from_str(field.value()).ok_or_else(|| {
+                        io::Error::new(io::ErrorKind::InvalidInput,
+                                       "`V` field contained an invalid value")
+                    })));
+                }
                 _ => {},
             }
         }
 
         Ok(DbError {
-            severity: try!(severity.ok_or_else(|| ::bad_response())),
+            severity: try!(severity.ok_or_else(|| {
+                io::Error::new(io::ErrorKind::InvalidInput, "`S` field missing")
+            })),
             parsed_severity: parsed_severity,
-            code: try!(code.ok_or_else(|| ::bad_response())),
-            message: try!(message.ok_or_else(|| ::bad_response())),
+            code: try!(code.ok_or_else(|| io::Error::new(io::ErrorKind::InvalidInput,
+                                                         "`C` field missing"))),
+            message: try!(message.ok_or_else(|| io::Error::new(io::ErrorKind::InvalidInput,
+                                                               "`M` field missing"))),
             detail: detail,
             hint: hint,
             position: match normal_position {
@@ -200,7 +223,10 @@ impl DbErrorNew for DbError {
                         Some(position) => {
                             Some(ErrorPosition::Internal {
                                 position: position,
-                                query: try!(internal_query.ok_or_else(|| ::bad_response())),
+                                query: try!(internal_query.ok_or_else(|| {
+                                    io::Error::new(io::ErrorKind::InvalidInput,
+                                                   "`q` field missing but `p` field present")
+                                })),
                             })
                         }
                         None => None,
@@ -220,14 +246,16 @@ impl DbErrorNew for DbError {
         })
     }
 
-    fn new_connect<T>(fields: &mut ErrorFields) -> result::Result<T, ConnectError> {
+    #[doc(hidden)]
+    pub fn new_connect<T>(fields: &mut ErrorFields) -> Result<T, ConnectError> {
         match DbError::new_raw(fields) {
             Ok(err) => Err(ConnectError::Db(Box::new(err))),
             Err(e) => Err(ConnectError::Io(e)),
         }
     }
 
-    fn new<T>(fields: &mut ErrorFields) -> Result<T> {
+    #[doc(hidden)]
+    pub fn new<T>(fields: &mut ErrorFields) -> Result<T, Error> {
         match DbError::new_raw(fields) {
             Ok(err) => Err(Error::Db(Box::new(err))),
             Err(e) => Err(Error::Io(e)),
diff --git a/postgres/src/error/sqlstate.rs b/postgres-shared/src/error/sqlstate.rs
similarity index 100%
rename from postgres/src/error/sqlstate.rs
rename to postgres-shared/src/error/sqlstate.rs
diff --git a/postgres-shared/src/lib.rs b/postgres-shared/src/lib.rs
index 4027c423..1448ca15 100644
--- a/postgres-shared/src/lib.rs
+++ b/postgres-shared/src/lib.rs
@@ -1,3 +1,9 @@
-extern crate hex;
+#![allow(unknown_lints)] // for clippy
 
+extern crate hex;
+extern crate fallible_iterator;
+extern crate phf;
+extern crate postgres_protocol;
+
+pub mod error;
 pub mod params;
diff --git a/postgres/Cargo.toml b/postgres/Cargo.toml
index e72069ae..1d89e01c 100644
--- a/postgres/Cargo.toml
+++ b/postgres/Cargo.toml
@@ -40,7 +40,6 @@ bufstream = "0.1"
 fallible-iterator = "0.1.3"
 hex = "0.2"
 log = "0.3"
-phf = "=0.7.20"
 postgres-protocol = "0.2"
 bit-vec = { version = "0.4", optional = true }
 chrono = { version = "0.2.14", optional = true }
@@ -54,5 +53,7 @@ serde_json = { version = ">= 0.6, < 0.9", optional = true }
 time = { version = "0.1.14", optional = true }
 uuid = { version = ">= 0.1, < 0.4", optional = true }
 
+postgres-shared = { path = "../postgres-shared" }
+
 [dev-dependencies]
 url = "1.0"
diff --git a/postgres/src/lib.rs b/postgres/src/lib.rs
index 0c58d082..86bfd186 100644
--- a/postgres/src/lib.rs
+++ b/postgres/src/lib.rs
@@ -76,8 +76,8 @@ extern crate hex;
 #[cfg(not(feature = "no-logging"))]
 #[macro_use]
 extern crate log;
-extern crate phf;
 extern crate postgres_protocol;
+extern crate postgres_shared;
 
 use fallible_iterator::{FallibleIterator, FromFallibleIterator};
 use std::cell::{Cell, RefCell};
@@ -90,7 +90,7 @@ use std::result;
 use std::sync::Arc;
 use std::time::Duration;
 use postgres_protocol::authentication;
-use postgres_protocol::message::backend::{self, ErrorFields};
+use postgres_protocol::message::backend;
 use postgres_protocol::message::frontend;
 
 use error::{Error, ConnectError, SqlState, DbError};
@@ -103,13 +103,15 @@ use stmt::{Statement, Column};
 use transaction::{Transaction, IsolationLevel};
 use types::{IsNull, Kind, Type, SessionInfo, Oid, Other, WrongType, ToSql, FromSql, Field};
 
+#[doc(inline)]
+pub use postgres_shared::error;
+
 #[macro_use]
 mod macros;
 
 mod feature_check;
 mod priv_io;
 mod url;
-pub mod error;
 pub mod tls;
 pub mod notification;
 pub mod params;
@@ -473,7 +475,7 @@ impl InnerConnection {
             .map_err(Into::into)
             .and_then(|oid| self.get_type(oid))
             .collect());
-        
+
         let columns = match raw_columns {
             Some(body) => {
                 try!(body.fields()
@@ -1373,12 +1375,6 @@ trait OtherNew {
     fn new(name: String, oid: Oid, kind: Kind, schema: String) -> Other;
 }
 
-trait DbErrorNew {
-    fn new_raw(fields: &mut ErrorFields) -> io::Result<DbError>;
-    fn new_connect<T>(fields: &mut ErrorFields) -> result::Result<T, ConnectError>;
-    fn new<T>(fields: &mut ErrorFields) -> Result<T>;
-}
-
 trait RowsNew<'a> {
     fn new(stmt: &'a Statement<'a>, data: Vec<RowData>) -> Rows<'a>;
     fn new_owned(stmt: Statement<'a>, data: Vec<RowData>) -> Rows<'a>;
diff --git a/postgres/src/stmt.rs b/postgres/src/stmt.rs
index 4fbbc6c0..0fb55f9c 100644
--- a/postgres/src/stmt.rs
+++ b/postgres/src/stmt.rs
@@ -13,7 +13,7 @@ use types::{SessionInfo, Type, ToSql};
 use rows::{Rows, LazyRows};
 use transaction::Transaction;
 use {bad_response, Connection, StatementInternals, Result, RowsNew, InnerConnection, RowData,
-     SessionInfoNew, LazyRowsNew, DbErrorNew, ColumnNew, StatementInfo, TransactionInternals};
+     SessionInfoNew, LazyRowsNew, ColumnNew, StatementInfo, TransactionInternals};
 
 /// A prepared statement.
 pub struct Statement<'conn> {