Move /src/test to /tests

tests/ui/impl-trait/explicit-generic-args-with-impl-trait/const-args.rs

@@ -0,0 +1,21 @@
+// check-pass
+
+trait Usizer {
+    fn m(self) -> usize;
+}
+
+fn f<const N: usize>(u: impl Usizer) -> usize {
+    N + u.m()
+}
+
+struct Usizable;
+
+impl Usizer for Usizable {
+    fn m(self) -> usize {
+        16
+    }
+}
+
+fn main() {
+    assert_eq!(f::<4usize>(Usizable), 20usize);
+}

tests/ui/impl-trait/explicit-generic-args-with-impl-trait/explicit-generic-args-for-impl.rs

@@ -0,0 +1,5 @@
+fn foo<T: ?Sized>(_f: impl AsRef<T>) {}
+
+fn main() {
+    foo::<str, String>("".to_string()); //~ ERROR E0107
+}

tests/ui/impl-trait/explicit-generic-args-with-impl-trait/explicit-generic-args-for-impl.stderr

@@ -0,0 +1,18 @@
+error[E0107]: this function takes 1 generic argument but 2 generic arguments were supplied
+  --> $DIR/explicit-generic-args-for-impl.rs:4:5
+   |
+LL |     foo::<str, String>("".to_string());
+   |     ^^^        ------ help: remove this generic argument
+   |     |
+   |     expected 1 generic argument
+   |
+note: function defined here, with 1 generic parameter: `T`
+  --> $DIR/explicit-generic-args-for-impl.rs:1:4
+   |
+LL | fn foo<T: ?Sized>(_f: impl AsRef<T>) {}
+   |    ^^^ -
+   = note: `impl Trait` cannot be explicitly specified as a generic argument
+
+error: aborting due to previous error
+
+For more information about this error, try `rustc --explain E0107`.

tests/ui/impl-trait/explicit-generic-args-with-impl-trait/explicit-generic-args.rs

@@ -0,0 +1,7 @@
+// check-pass
+
+fn foo<T: ?Sized>(_f: impl AsRef<T>) {}
+
+fn main() {
+    foo::<str>("".to_string());
+}

tests/ui/impl-trait/explicit-generic-args-with-impl-trait/issue-87718.rs

@@ -0,0 +1,7 @@
+// check-pass
+
+fn f<T: ?Sized>(_: impl AsRef<T>, _: impl AsRef<T>) {}
+
+fn main() {
+    f::<[u8]>("a", b"a");
+}

tests/ui/impl-trait/explicit-generic-args-with-impl-trait/not-enough-args.rs

@@ -0,0 +1,6 @@
+fn f<T: ?Sized, U: ?Sized>(_: impl AsRef<T>, _: impl AsRef<U>) {}
+
+fn main() {
+    f::<[u8]>("a", b"a");
+    //~^ ERROR function takes 2 generic arguments but 1 generic argument was supplied
+}

tests/ui/impl-trait/explicit-generic-args-with-impl-trait/not-enough-args.stderr

@@ -0,0 +1,21 @@
+error[E0107]: this function takes 2 generic arguments but 1 generic argument was supplied
+  --> $DIR/not-enough-args.rs:4:5
+   |
+LL |     f::<[u8]>("a", b"a");
+   |     ^   ---- supplied 1 generic argument
+   |     |
+   |     expected 2 generic arguments
+   |
+note: function defined here, with 2 generic parameters: `T`, `U`
+  --> $DIR/not-enough-args.rs:1:4
+   |
+LL | fn f<T: ?Sized, U: ?Sized>(_: impl AsRef<T>, _: impl AsRef<U>) {}
+   |    ^ -          -
+help: add missing generic argument
+   |
+LL |     f::<[u8], U>("a", b"a");
+   |             +++
+
+error: aborting due to previous error
+
+For more information about this error, try `rustc --explain E0107`.