Include const generic arguments in metadata.

src/test/ui/const-generics/auxiliary/const_generic_lib.rs

@@ -0,0 +1,9 @@
+#![feature(const_generics)]
+
+pub struct Struct<const N: usize>(pub [u8; N]);
+
+pub type Alias = Struct<2>;
+
+pub fn function(value: Struct<3>) -> u8 {
+    value.0[0]
+}

src/test/ui/const-generics/const-argument-cross-crate-mismatch.rs

@@ -0,0 +1,10 @@
+// aux-build:const_generic_lib.rs
+
+extern crate const_generic_lib;
+
+fn main() {
+    let _ = const_generic_lib::function(const_generic_lib::Struct([0u8, 1u8]));
+    //~^ ERROR mismatched types
+    let _: const_generic_lib::Alias = const_generic_lib::Struct([0u8, 1u8, 2u8]);
+    //~^ ERROR mismatched types
+}

src/test/ui/const-generics/const-argument-cross-crate-mismatch.stderr

@@ -0,0 +1,21 @@
+error[E0308]: mismatched types
+  --> $DIR/const-argument-cross-crate-mismatch.rs:6:41
+   |
+LL |     let _ = const_generic_lib::function(const_generic_lib::Struct([0u8, 1u8]));
+   |                                         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ expected `3usize`, found `2usize`
+   |
+   = note: expected type `const_generic_lib::Struct<3usize>`
+              found type `const_generic_lib::Struct<_: usize>`
+
+error[E0308]: mismatched types
+  --> $DIR/const-argument-cross-crate-mismatch.rs:8:39
+   |
+LL |     let _: const_generic_lib::Alias = const_generic_lib::Struct([0u8, 1u8, 2u8]);
+   |                                       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ expected `2usize`, found `3usize`
+   |
+   = note: expected type `const_generic_lib::Struct<2usize>`
+              found type `const_generic_lib::Struct<_: usize>`
+
+error: aborting due to 2 previous errors
+
+For more information about this error, try `rustc --explain E0308`.

src/test/ui/const-generics/const-argument-cross-crate.rs

@@ -0,0 +1,12 @@
+// run-pass
+// aux-build:const_generic_lib.rs
+
+extern crate const_generic_lib;
+
+struct Container(const_generic_lib::Alias);
+
+fn main() {
+    let res = const_generic_lib::function(const_generic_lib::Struct([14u8, 1u8, 2u8]));
+    assert_eq!(res, 14u8);
+    let _ = Container(const_generic_lib::Struct([0u8, 1u8]));
+}