add test for extern crates

Author: lcnr

src/test/ui/const-generics/type-dependent/auxiliary/type_dependent_lib.rs

@@ -0,0 +1,36 @@
+#![feature(const_generics)]
+#![allow(incomplete_features)]
+
+pub struct Struct<const N: usize>(());
+
+impl<const N: usize> Struct<N> {
+    pub fn new() -> Self {
+        Struct(())
+    }
+
+    pub fn same_ty<const M: usize>(&self) -> (usize, usize) {
+        (N, M)
+    }
+
+    pub fn different_ty<const M: u8>(&self) -> (usize, u8) {
+        (N, M)
+    }
+
+    pub fn containing_ty<T, const M: u8>(&self) -> (usize, u8) {
+        (std::mem::size_of::<T>() +  N, M)
+    }
+
+    pub fn we_have_to_go_deeper<const M: usize>(&self) -> Struct<M> {
+        Struct(())
+    }
+}
+
+pub trait Foo {
+    fn foo<const M: usize>(&self) -> usize;
+}
+
+impl Foo for Struct<7> {
+    fn foo<const M: usize>(&self) -> usize {
+        M
+    }
+}

src/test/ui/const-generics/type-dependent/non-local.rs

@@ -0,0 +1,24 @@
+// aux-build:type_dependent_lib.rs
+// run-pass
+#![feature(const_generics)]
+#![allow(incomplete_features)]
+
+extern crate type_dependent_lib;
+
+use type_dependent_lib::*;
+
+fn main() {
+    let s = Struct::<42>::new();
+    assert_eq!(s.same_ty::<7>(), (42, 7));
+    assert_eq!(s.different_ty::<19>(), (42, 19));
+    assert_eq!(Struct::<1337>::new().different_ty::<96>(), (1337, 96));
+    assert_eq!(
+        Struct::<18>::new()
+            .we_have_to_go_deeper::<19>()
+            .containing_ty::<Option<u32>, 3>(),
+        (27, 3),
+    );
+
+    let s = Struct::<7>::new();
+    assert_eq!(s.foo::<18>(), 18);
+}