diff --git a/core/codegen/src/attribute/route.rs b/core/codegen/src/attribute/route.rs
index 7aa8d945..6b90e111 100644
--- a/core/codegen/src/attribute/route.rs
+++ b/core/codegen/src/attribute/route.rs
@@ -1,3 +1,6 @@
+use std::collections::hash_map::DefaultHasher;
+use std::hash::{Hash, Hasher};
+
 use proc_macro::{TokenStream, Span};
 use crate::proc_macro2::TokenStream as TokenStream2;
 use devise::{syn, Spanned, SpanWrapped, Result, FromMeta, ext::TypeExt};
@@ -325,15 +328,31 @@ fn generate_internal_uri_macro(route: &Route) -> TokenStream2 {
         .map(|name| route.inputs.iter().find(|(ident, ..)| ident == name).unwrap())
         .map(|(ident, _, ty)| quote!(#ident: #ty));
 
-    let generated_macro_name = route.function.ident.prepend(URI_MACRO_PREFIX);
+    let mut hasher = DefaultHasher::new();
+    let route_span = route.function.span();
+    route_span.source_file().path().hash(&mut hasher);
+    let line_column = route_span.start();
+    line_column.line.hash(&mut hasher);
+    line_column.column.hash(&mut hasher);
+
+    let mut generated_macro_name = route.function.ident.prepend(URI_MACRO_PREFIX);
+    generated_macro_name.set_span(Span::call_site().into());
+    let inner_generated_macro_name = generated_macro_name.append(&hasher.finish().to_string());
     let route_uri = route.attribute.path.origin.0.to_string();
 
     quote! {
-        pub macro #generated_macro_name($($token:tt)*) {{
-            extern crate std;
-            extern crate rocket;
-            rocket::rocket_internal_uri!(#route_uri, (#(#dynamic_args),*), $($token)*)
-        }}
+        #[doc(hidden)]
+        #[macro_export]
+        macro_rules! #inner_generated_macro_name {
+            ($($token:tt)*) => {{
+                extern crate std;
+                extern crate rocket;
+                rocket::rocket_internal_uri!(#route_uri, (#(#dynamic_args),*), $($token)*)
+            }};
+        }
+
+        #[doc(hidden)]
+        pub use #inner_generated_macro_name as #generated_macro_name;
     }
 }
 
diff --git a/core/codegen/src/syn_ext.rs b/core/codegen/src/syn_ext.rs
index 477fe63c..1126f8d5 100644
--- a/core/codegen/src/syn_ext.rs
+++ b/core/codegen/src/syn_ext.rs
@@ -9,12 +9,17 @@ pub fn syn_to_diag(error: syn::parse::Error) -> Diagnostic {
 
 pub trait IdentExt {
     fn prepend(&self, string: &str) -> syn::Ident;
+    fn append(&self, string: &str) -> syn::Ident;
 }
 
 impl IdentExt for syn::Ident {
     fn prepend(&self, string: &str) -> syn::Ident {
         syn::Ident::new(&format!("{}{}", string, self), self.span())
     }
+
+    fn append(&self, string: &str) -> syn::Ident {
+        syn::Ident::new(&format!("{}{}", self, string), self.span())
+    }
 }
 
 pub trait ReturnTypeExt {
diff --git a/core/codegen/tests/ui-fail/typed-uris-bad-params.stderr b/core/codegen/tests/ui-fail/typed-uris-bad-params.stderr
index 6ca80e67..20ed1d0c 100644
--- a/core/codegen/tests/ui-fail/typed-uris-bad-params.stderr
+++ b/core/codegen/tests/ui-fail/typed-uris-bad-params.stderr
@@ -1,196 +1,28 @@
-error: `has_one` route uri expects 1 parameter but 0 were supplied
-  --> $DIR/typed-uris-bad-params.rs:22:10
+error: path parameters cannot be ignored
+  --> $DIR/typed-uris-bad-params.rs:79:37
    |
-22 |     uri!(has_one); //~ ERROR expects 1 parameter but 0
-   |          ^^^^^^^
-   |
-   = note: expected parameter: id: i32
+79 |     uri!(optionals: id = 10, name = _);
+   |                                     ^
 
-error: `has_one` route uri expects 1 parameter but 2 were supplied
-  --> $DIR/typed-uris-bad-params.rs:24:19
+error: path parameters cannot be ignored
+  --> $DIR/typed-uris-bad-params.rs:76:26
    |
-24 |     uri!(has_one: 1, 23); //~ ERROR expects 1 parameter but 2
-   |                   ^^^^^
-   |
-   = note: expected parameter: id: i32
-
-error: `has_one` route uri expects 1 parameter but 2 were supplied
-  --> $DIR/typed-uris-bad-params.rs:25:19
-   |
-25 |     uri!(has_one: "Hello", 23, ); //~ ERROR expects 1 parameter but 2
-   |                   ^^^^^^^^^^^^
-   |
-   = note: expected parameter: id: i32
-
-error: `has_one_guarded` route uri expects 1 parameter but 2 were supplied
-  --> $DIR/typed-uris-bad-params.rs:26:27
-   |
-26 |     uri!(has_one_guarded: "hi", 100); //~ ERROR expects 1 parameter but 2
-   |                           ^^^^^^^^^
-   |
-   = note: expected parameter: id: i32
-
-error: `has_two` route uri expects 2 parameters but 3 were supplied
-  --> $DIR/typed-uris-bad-params.rs:28:19
-   |
-28 |     uri!(has_two: 10, "hi", "there"); //~ ERROR expects 2 parameters but 3
-   |                   ^^^^^^^^^^^^^^^^^
-   |
-   = note: expected parameters: id: i32, name: String
-
-error: `has_two` route uri expects 2 parameters but 1 was supplied
-  --> $DIR/typed-uris-bad-params.rs:29:19
-   |
-29 |     uri!(has_two: 10); //~ ERROR expects 2 parameters but 1
-   |                   ^^
-   |
-   = note: expected parameters: id: i32, name: String
-
-error: invalid parameters for `has_one` route uri
-  --> $DIR/typed-uris-bad-params.rs:31:19
-   |
-31 |     uri!(has_one: id = 100, name = "hi"); //~ ERROR invalid parameters
-   |                   ^^^^^^^^^^^^^^^^^^^^^
-   |
-   = note: uri parameters are: id: i32
-help: unknown parameter: `name`
-  --> $DIR/typed-uris-bad-params.rs:31:29
-   |
-31 |     uri!(has_one: id = 100, name = "hi"); //~ ERROR invalid parameters
-   |                             ^^^^
-
-error: invalid parameters for `has_one` route uri
-  --> $DIR/typed-uris-bad-params.rs:34:19
-   |
-34 |     uri!(has_one: name = 100, id = 100); //~ ERROR invalid parameters
-   |                   ^^^^^^^^^^^^^^^^^^^^
-   |
-   = note: uri parameters are: id: i32
-help: unknown parameter: `name`
-  --> $DIR/typed-uris-bad-params.rs:34:19
-   |
-34 |     uri!(has_one: name = 100, id = 100); //~ ERROR invalid parameters
-   |                   ^^^^
-
-error: invalid parameters for `has_one` route uri
-  --> $DIR/typed-uris-bad-params.rs:37:19
-   |
-37 |     uri!(has_one: name = 100, age = 50, id = 100); //~ ERROR invalid parameters
-   |                   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
-   |
-   = note: uri parameters are: id: i32
-help: unknown parameters: `name`, `age`
-  --> $DIR/typed-uris-bad-params.rs:37:19
-   |
-37 |     uri!(has_one: name = 100, age = 50, id = 100); //~ ERROR invalid parameters
-   |                   ^^^^        ^^^
-
-error: invalid parameters for `has_one` route uri
-  --> $DIR/typed-uris-bad-params.rs:40:19
-   |
-40 |     uri!(has_one: name = 100, age = 50, id = 100, id = 50); //~ ERROR invalid parameters
-   |                   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
-   |
-   = note: uri parameters are: id: i32
-help: unknown parameters: `name`, `age`
-  --> $DIR/typed-uris-bad-params.rs:40:19
-   |
-40 |     uri!(has_one: name = 100, age = 50, id = 100, id = 50); //~ ERROR invalid parameters
-   |                   ^^^^        ^^^
-help: duplicate parameter: `id`
-  --> $DIR/typed-uris-bad-params.rs:40:51
-   |
-40 |     uri!(has_one: name = 100, age = 50, id = 100, id = 50); //~ ERROR invalid parameters
-   |                                                   ^^
-
-error: invalid parameters for `has_one` route uri
-  --> $DIR/typed-uris-bad-params.rs:44:19
-   |
-44 |     uri!(has_one: id = 100, id = 100); //~ ERROR invalid parameters
-   |                   ^^^^^^^^^^^^^^^^^^
-   |
-   = note: uri parameters are: id: i32
-help: duplicate parameter: `id`
-  --> $DIR/typed-uris-bad-params.rs:44:29
-   |
-44 |     uri!(has_one: id = 100, id = 100); //~ ERROR invalid parameters
-   |                             ^^
-
-error: invalid parameters for `has_one` route uri
-  --> $DIR/typed-uris-bad-params.rs:47:19
-   |
-47 |     uri!(has_one: id = 100, id = 100, ); //~ ERROR invalid parameters
-   |                   ^^^^^^^^^^^^^^^^^^^
-   |
-   = note: uri parameters are: id: i32
-help: duplicate parameter: `id`
-  --> $DIR/typed-uris-bad-params.rs:47:29
-   |
-47 |     uri!(has_one: id = 100, id = 100, ); //~ ERROR invalid parameters
-   |                             ^^
-
-error: invalid parameters for `has_one` route uri
-  --> $DIR/typed-uris-bad-params.rs:50:19
-   |
-50 |     uri!(has_one: name = "hi"); //~ ERROR invalid parameters
-   |                   ^^^^^^^^^^^
-   |
-   = note: uri parameters are: id: i32
-   = help: missing parameter: `id`
-help: unknown parameter: `name`
-  --> $DIR/typed-uris-bad-params.rs:50:19
-   |
-50 |     uri!(has_one: name = "hi"); //~ ERROR invalid parameters
-   |                   ^^^^
-
-error: invalid parameters for `has_one_guarded` route uri
-  --> $DIR/typed-uris-bad-params.rs:54:27
-   |
-54 |     uri!(has_one_guarded: cookies = "hi", id = 100); //~ ERROR invalid parameters
-   |                           ^^^^^^^^^^^^^^^^^^^^^^^^
-   |
-   = note: uri parameters are: id: i32
-help: unknown parameter: `cookies`
-  --> $DIR/typed-uris-bad-params.rs:54:27
-   |
-54 |     uri!(has_one_guarded: cookies = "hi", id = 100); //~ ERROR invalid parameters
-   |                           ^^^^^^^
-
-error: invalid parameters for `has_one_guarded` route uri
-  --> $DIR/typed-uris-bad-params.rs:57:27
-   |
-57 |     uri!(has_one_guarded: id = 100, cookies = "hi"); //~ ERROR invalid parameters
-   |                           ^^^^^^^^^^^^^^^^^^^^^^^^
-   |
-   = note: uri parameters are: id: i32
-help: unknown parameter: `cookies`
-  --> $DIR/typed-uris-bad-params.rs:57:37
-   |
-57 |     uri!(has_one_guarded: id = 100, cookies = "hi"); //~ ERROR invalid parameters
-   |                                     ^^^^^^^
+76 |     uri!(optionals: id = _, name = "bob".into());
+   |                          ^
 
 error: invalid parameters for `has_two` route uri
-  --> $DIR/typed-uris-bad-params.rs:60:19
+  --> $DIR/typed-uris-bad-params.rs:72:19
    |
-60 |     uri!(has_two: id = 100, id = 100, ); //~ ERROR invalid parameters
-   |                   ^^^^^^^^^^^^^^^^^^^
+72 |     uri!(has_two: id = 100, cookies = "hi"); //~ ERROR invalid parameters
+   |                   ^^^^^^^^^^^^^^^^^^^^^^^^
    |
    = note: uri parameters are: id: i32, name: String
    = help: missing parameter: `name`
-help: duplicate parameter: `id`
-  --> $DIR/typed-uris-bad-params.rs:60:29
+help: unknown parameter: `cookies`
+  --> $DIR/typed-uris-bad-params.rs:72:29
    |
-60 |     uri!(has_two: id = 100, id = 100, ); //~ ERROR invalid parameters
-   |                             ^^
-
-error: invalid parameters for `has_two` route uri
-  --> $DIR/typed-uris-bad-params.rs:64:19
-   |
-64 |     uri!(has_two: name = "hi"); //~ ERROR invalid parameters
-   |                   ^^^^^^^^^^^
-   |
-   = note: uri parameters are: id: i32, name: String
-   = help: missing parameter: `id`
+72 |     uri!(has_two: id = 100, cookies = "hi"); //~ ERROR invalid parameters
+   |                             ^^^^^^^
 
 error: invalid parameters for `has_two` route uri
   --> $DIR/typed-uris-bad-params.rs:67:19
@@ -212,30 +44,198 @@ help: duplicate parameter: `id`
    |                                             ^^       ^^
 
 error: invalid parameters for `has_two` route uri
-  --> $DIR/typed-uris-bad-params.rs:72:19
+  --> $DIR/typed-uris-bad-params.rs:64:19
    |
-72 |     uri!(has_two: id = 100, cookies = "hi"); //~ ERROR invalid parameters
-   |                   ^^^^^^^^^^^^^^^^^^^^^^^^
+64 |     uri!(has_two: name = "hi"); //~ ERROR invalid parameters
+   |                   ^^^^^^^^^^^
+   |
+   = note: uri parameters are: id: i32, name: String
+   = help: missing parameter: `id`
+
+error: invalid parameters for `has_two` route uri
+  --> $DIR/typed-uris-bad-params.rs:60:19
+   |
+60 |     uri!(has_two: id = 100, id = 100, ); //~ ERROR invalid parameters
+   |                   ^^^^^^^^^^^^^^^^^^^
    |
    = note: uri parameters are: id: i32, name: String
    = help: missing parameter: `name`
+help: duplicate parameter: `id`
+  --> $DIR/typed-uris-bad-params.rs:60:29
+   |
+60 |     uri!(has_two: id = 100, id = 100, ); //~ ERROR invalid parameters
+   |                             ^^
+
+error: invalid parameters for `has_one_guarded` route uri
+  --> $DIR/typed-uris-bad-params.rs:57:27
+   |
+57 |     uri!(has_one_guarded: id = 100, cookies = "hi"); //~ ERROR invalid parameters
+   |                           ^^^^^^^^^^^^^^^^^^^^^^^^
+   |
+   = note: uri parameters are: id: i32
 help: unknown parameter: `cookies`
-  --> $DIR/typed-uris-bad-params.rs:72:29
+  --> $DIR/typed-uris-bad-params.rs:57:37
    |
-72 |     uri!(has_two: id = 100, cookies = "hi"); //~ ERROR invalid parameters
-   |                             ^^^^^^^
+57 |     uri!(has_one_guarded: id = 100, cookies = "hi"); //~ ERROR invalid parameters
+   |                                     ^^^^^^^
 
-error: path parameters cannot be ignored
-  --> $DIR/typed-uris-bad-params.rs:76:26
+error: invalid parameters for `has_one_guarded` route uri
+  --> $DIR/typed-uris-bad-params.rs:54:27
    |
-76 |     uri!(optionals: id = _, name = "bob".into());
-   |                          ^
+54 |     uri!(has_one_guarded: cookies = "hi", id = 100); //~ ERROR invalid parameters
+   |                           ^^^^^^^^^^^^^^^^^^^^^^^^
+   |
+   = note: uri parameters are: id: i32
+help: unknown parameter: `cookies`
+  --> $DIR/typed-uris-bad-params.rs:54:27
+   |
+54 |     uri!(has_one_guarded: cookies = "hi", id = 100); //~ ERROR invalid parameters
+   |                           ^^^^^^^
 
-error: path parameters cannot be ignored
-  --> $DIR/typed-uris-bad-params.rs:79:37
+error: invalid parameters for `has_one` route uri
+  --> $DIR/typed-uris-bad-params.rs:50:19
    |
-79 |     uri!(optionals: id = 10, name = _);
-   |                                     ^
+50 |     uri!(has_one: name = "hi"); //~ ERROR invalid parameters
+   |                   ^^^^^^^^^^^
+   |
+   = note: uri parameters are: id: i32
+   = help: missing parameter: `id`
+help: unknown parameter: `name`
+  --> $DIR/typed-uris-bad-params.rs:50:19
+   |
+50 |     uri!(has_one: name = "hi"); //~ ERROR invalid parameters
+   |                   ^^^^
+
+error: invalid parameters for `has_one` route uri
+  --> $DIR/typed-uris-bad-params.rs:47:19
+   |
+47 |     uri!(has_one: id = 100, id = 100, ); //~ ERROR invalid parameters
+   |                   ^^^^^^^^^^^^^^^^^^^
+   |
+   = note: uri parameters are: id: i32
+help: duplicate parameter: `id`
+  --> $DIR/typed-uris-bad-params.rs:47:29
+   |
+47 |     uri!(has_one: id = 100, id = 100, ); //~ ERROR invalid parameters
+   |                             ^^
+
+error: invalid parameters for `has_one` route uri
+  --> $DIR/typed-uris-bad-params.rs:44:19
+   |
+44 |     uri!(has_one: id = 100, id = 100); //~ ERROR invalid parameters
+   |                   ^^^^^^^^^^^^^^^^^^
+   |
+   = note: uri parameters are: id: i32
+help: duplicate parameter: `id`
+  --> $DIR/typed-uris-bad-params.rs:44:29
+   |
+44 |     uri!(has_one: id = 100, id = 100); //~ ERROR invalid parameters
+   |                             ^^
+
+error: invalid parameters for `has_one` route uri
+  --> $DIR/typed-uris-bad-params.rs:40:19
+   |
+40 |     uri!(has_one: name = 100, age = 50, id = 100, id = 50); //~ ERROR invalid parameters
+   |                   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+   |
+   = note: uri parameters are: id: i32
+help: unknown parameters: `name`, `age`
+  --> $DIR/typed-uris-bad-params.rs:40:19
+   |
+40 |     uri!(has_one: name = 100, age = 50, id = 100, id = 50); //~ ERROR invalid parameters
+   |                   ^^^^        ^^^
+help: duplicate parameter: `id`
+  --> $DIR/typed-uris-bad-params.rs:40:51
+   |
+40 |     uri!(has_one: name = 100, age = 50, id = 100, id = 50); //~ ERROR invalid parameters
+   |                                                   ^^
+
+error: invalid parameters for `has_one` route uri
+  --> $DIR/typed-uris-bad-params.rs:37:19
+   |
+37 |     uri!(has_one: name = 100, age = 50, id = 100); //~ ERROR invalid parameters
+   |                   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+   |
+   = note: uri parameters are: id: i32
+help: unknown parameters: `name`, `age`
+  --> $DIR/typed-uris-bad-params.rs:37:19
+   |
+37 |     uri!(has_one: name = 100, age = 50, id = 100); //~ ERROR invalid parameters
+   |                   ^^^^        ^^^
+
+error: invalid parameters for `has_one` route uri
+  --> $DIR/typed-uris-bad-params.rs:34:19
+   |
+34 |     uri!(has_one: name = 100, id = 100); //~ ERROR invalid parameters
+   |                   ^^^^^^^^^^^^^^^^^^^^
+   |
+   = note: uri parameters are: id: i32
+help: unknown parameter: `name`
+  --> $DIR/typed-uris-bad-params.rs:34:19
+   |
+34 |     uri!(has_one: name = 100, id = 100); //~ ERROR invalid parameters
+   |                   ^^^^
+
+error: invalid parameters for `has_one` route uri
+  --> $DIR/typed-uris-bad-params.rs:31:19
+   |
+31 |     uri!(has_one: id = 100, name = "hi"); //~ ERROR invalid parameters
+   |                   ^^^^^^^^^^^^^^^^^^^^^
+   |
+   = note: uri parameters are: id: i32
+help: unknown parameter: `name`
+  --> $DIR/typed-uris-bad-params.rs:31:29
+   |
+31 |     uri!(has_one: id = 100, name = "hi"); //~ ERROR invalid parameters
+   |                             ^^^^
+
+error: `has_two` route uri expects 2 parameters but 1 was supplied
+  --> $DIR/typed-uris-bad-params.rs:29:19
+   |
+29 |     uri!(has_two: 10); //~ ERROR expects 2 parameters but 1
+   |                   ^^
+   |
+   = note: expected parameters: id: i32, name: String
+
+error: `has_two` route uri expects 2 parameters but 3 were supplied
+  --> $DIR/typed-uris-bad-params.rs:28:19
+   |
+28 |     uri!(has_two: 10, "hi", "there"); //~ ERROR expects 2 parameters but 3
+   |                   ^^^^^^^^^^^^^^^^^
+   |
+   = note: expected parameters: id: i32, name: String
+
+error: `has_one_guarded` route uri expects 1 parameter but 2 were supplied
+  --> $DIR/typed-uris-bad-params.rs:26:27
+   |
+26 |     uri!(has_one_guarded: "hi", 100); //~ ERROR expects 1 parameter but 2
+   |                           ^^^^^^^^^
+   |
+   = note: expected parameter: id: i32
+
+error: `has_one` route uri expects 1 parameter but 2 were supplied
+  --> $DIR/typed-uris-bad-params.rs:25:19
+   |
+25 |     uri!(has_one: "Hello", 23, ); //~ ERROR expects 1 parameter but 2
+   |                   ^^^^^^^^^^^^
+   |
+   = note: expected parameter: id: i32
+
+error: `has_one` route uri expects 1 parameter but 2 were supplied
+  --> $DIR/typed-uris-bad-params.rs:24:19
+   |
+24 |     uri!(has_one: 1, 23); //~ ERROR expects 1 parameter but 2
+   |                   ^^^^^
+   |
+   = note: expected parameter: id: i32
+
+error: `has_one` route uri expects 1 parameter but 0 were supplied
+  --> $DIR/typed-uris-bad-params.rs:22:10
+   |
+22 |     uri!(has_one); //~ ERROR expects 1 parameter but 0
+   |          ^^^^^^^
+   |
+   = note: expected parameter: id: i32
 
 error: aborting due to 21 previous errors
 
diff --git a/examples/hello_2018/src/main.rs b/examples/hello_2018/src/main.rs
index 132833ff..d8d7c473 100644
--- a/examples/hello_2018/src/main.rs
+++ b/examples/hello_2018/src/main.rs
@@ -1,4 +1,4 @@
-#![feature(proc_macro_hygiene, decl_macro)]
+#![feature(proc_macro_hygiene)]
 
 #[cfg(test)] mod tests;