diff --git a/src/bin/cargo-read-manifest.rs b/src/bin/cargo-read-manifest.rs
index 1f8c63199..ca404afb2 100644
--- a/src/bin/cargo-read-manifest.rs
+++ b/src/bin/cargo-read-manifest.rs
@@ -9,12 +9,13 @@ extern crate toml;
 use hammer::FlagConfig;
 use serialize::Decoder;
 use toml::from_toml;
-use cargo::{Manifest,LibTarget,ExecTarget,Project,CargoResult,ToCargoError,execute_main_without_stdin};
+use cargo::core;
+use cargo::{CargoResult,ToCargoError,execute_main_without_stdin};
 use std::path::Path;
 
 #[deriving(Decodable,Encodable,Eq,Clone,Ord)]
 struct SerializedManifest {
-    project: ~Project,
+    project: ~core::Project,
     lib: Option<~[SerializedLibTarget]>,
     bin: Option<~[SerializedExecTarget]>
 }
@@ -37,10 +38,10 @@ struct ReadManifestFlags {
 impl FlagConfig for ReadManifestFlags {}
 
 fn main() {
-    execute_main_without_stdin::<ReadManifestFlags, Manifest>(execute);
+    execute_main_without_stdin(execute);
 }
 
-fn execute(flags: ReadManifestFlags) -> CargoResult<Option<Manifest>> {
+fn execute(flags: ReadManifestFlags) -> CargoResult<Option<core::Manifest>> {
     let manifest_path = flags.manifest_path;
     let root = try!(toml::parse_from_file(manifest_path.clone()).to_cargo_error(format!("Couldn't parse Toml file: {}", manifest_path), 1));
 
@@ -48,7 +49,7 @@ fn execute(flags: ReadManifestFlags) -> CargoResult<Option<Manifest>> {
 
     let (lib, bin) = normalize(&toml_manifest.lib, &toml_manifest.bin);
 
-    Ok(Some(Manifest {
+    Ok(Some(core::Manifest {
         root: try!(Path::new(manifest_path.clone()).dirname_str().to_cargo_error(format!("Could not get dirname from {}", manifest_path), 1)).to_owned(),
         project: toml_manifest.project,
         lib: lib,
@@ -56,17 +57,17 @@ fn execute(flags: ReadManifestFlags) -> CargoResult<Option<Manifest>> {
     }))
 }
 
-fn normalize(lib: &Option<~[SerializedLibTarget]>, bin: &Option<~[SerializedExecTarget]>) -> (~[LibTarget], ~[ExecTarget]) {
-    fn lib_targets(libs: &[SerializedLibTarget]) -> ~[LibTarget] {
+fn normalize(lib: &Option<~[SerializedLibTarget]>, bin: &Option<~[SerializedExecTarget]>) -> (~[core::LibTarget], ~[core::ExecTarget]) {
+    fn lib_targets(libs: &[SerializedLibTarget]) -> ~[core::LibTarget] {
         let l = &libs[0];
         let path = l.path.clone().unwrap_or_else(|| format!("src/{}.rs", l.name));
-        ~[LibTarget{ path: path, name: l.name.clone() }]
+        ~[core::LibTarget { path: path, name: l.name.clone() }]
     }
 
-    fn bin_targets(bins: &[SerializedExecTarget], default: |&SerializedExecTarget| -> ~str) -> ~[ExecTarget] {
+    fn bin_targets(bins: &[SerializedExecTarget], default: |&SerializedExecTarget| -> ~str) -> ~[core::ExecTarget] {
         bins.iter().map(|bin| {
             let path = bin.path.clone().unwrap_or_else(|| default(bin));
-            ExecTarget{ path: path, name: bin.name.clone() }
+            core::ExecTarget { path: path, name: bin.name.clone() }
         }).collect()
     }
 
diff --git a/src/bin/cargo-rustc.rs b/src/bin/cargo-rustc.rs
index 9fa762236..7f4304a49 100644
--- a/src/bin/cargo-rustc.rs
+++ b/src/bin/cargo-rustc.rs
@@ -10,7 +10,8 @@ use std::os::args;
 use std::io;
 use std::io::process::{Process,ProcessConfig,InheritFd};
 use std::path::Path;
-use cargo::{Manifest,CargoResult,CargoError,ToCargoError,NoFlags,execute_main};
+use cargo::{CargoResult,CargoError,ToCargoError,NoFlags,execute_main};
+use cargo::core;
 
 /**
     cargo-rustc -- ...args
@@ -19,11 +20,11 @@ use cargo::{Manifest,CargoResult,CargoError,ToCargoError,NoFlags,execute_main};
 */
 
 fn main() {
-    execute_main::<NoFlags, Manifest, Manifest>(execute);
+    execute_main(execute);
 }
 
-fn execute(_: NoFlags, manifest: Manifest) -> CargoResult<Option<Manifest>> {
-    let Manifest{ root, lib, bin, .. } = manifest;
+fn execute(_: NoFlags, manifest: core::Manifest) -> CargoResult<Option<core::Manifest>> {
+    let core::Manifest { root, lib, bin, .. } = manifest;
 
     let (crate_type, out_dir) = if lib.len() > 0 {
         ( ~"lib", lib[0].path )
diff --git a/src/cargo/core/manifest.rs b/src/cargo/core/manifest.rs
new file mode 100644
index 000000000..a91ca30d9
--- /dev/null
+++ b/src/cargo/core/manifest.rs
@@ -0,0 +1,31 @@
+
+/*
+ * TODO: Make all struct fields private
+ */
+
+#[deriving(Decodable,Encodable,Eq,Clone,Ord)]
+pub struct Manifest {
+    pub project: ~Project,
+    pub root: ~str,
+    pub lib: ~[LibTarget],
+    pub bin: ~[ExecTarget]
+}
+
+#[deriving(Decodable,Encodable,Eq,Clone,Ord)]
+pub struct ExecTarget {
+    pub name: ~str,
+    pub path: ~str
+}
+
+#[deriving(Decodable,Encodable,Eq,Clone,Ord)]
+pub struct LibTarget {
+    pub name: ~str,
+    pub path: ~str
+}
+
+#[deriving(Decodable,Encodable,Eq,Clone,Ord)]
+pub struct Project {
+    pub name: ~str,
+    pub version: ~str,
+    pub authors: ~[~str]
+}
diff --git a/src/cargo/core/mod.rs b/src/cargo/core/mod.rs
new file mode 100644
index 000000000..e13802c89
--- /dev/null
+++ b/src/cargo/core/mod.rs
@@ -0,0 +1,8 @@
+
+pub use self::manifest::{
+  Manifest,
+  Project,
+  LibTarget,
+  ExecTarget};
+
+mod manifest;
diff --git a/src/cargo/mod.rs b/src/cargo/mod.rs
index 51425231e..43701c701 100644
--- a/src/cargo/mod.rs
+++ b/src/cargo/mod.rs
@@ -12,38 +12,9 @@ use std::fmt;
 use std::fmt::{Show,Formatter};
 use hammer::{FlagDecoder,FlagConfig,HammerError};
 
+pub mod core;
 pub mod util;
 
-#[deriving(Decodable,Encodable,Eq,Clone,Ord)]
-pub struct Manifest {
-    pub project: ~Project,
-    pub root: ~str,
-    pub lib: ~[LibTarget],
-    pub bin: ~[ExecTarget]
-}
-
-#[deriving(Decodable,Encodable,Eq,Clone,Ord)]
-pub struct ExecTarget {
-    pub name: ~str,
-    pub path: ~str
-}
-
-#[deriving(Decodable,Encodable,Eq,Clone,Ord)]
-pub struct LibTarget {
-    pub name: ~str,
-    pub path: ~str
-}
-
-//pub type LibTarget = Target;
-//pub type ExecTarget = Target;
-
-#[deriving(Decodable,Encodable,Eq,Clone,Ord)]
-pub struct Project {
-    pub name: ~str,
-    pub version: ~str,
-    pub authors: ~[~str]
-}
-
 pub type CargoResult<T> = Result<T, CargoError>;
 
 pub struct CargoError {