2 files changed, 105 insertions, 0 deletions
diff --git a/src/test/ui/suggestions/unnamable-types.rs b/src/test/ui/suggestions/unnamable-types.rs
new file mode 100644
index 00000000000..5d0616443e5
--- /dev/null
+++ b/src/test/ui/suggestions/unnamable-types.rs
@@ -0,0 +1,39 @@
+// Test that we do not suggest to add type annotations for unnamable types.
+
+#![crate_type="lib"]
+#![feature(generators)]
+
+const A = 5;
+//~^ ERROR: missing type for `const` item
+//~| HELP: provide a type for the item
+
+static B: _ = "abc";
+//~^ ERROR: the type placeholder `_` is not allowed within types on item signatures
+//~| NOTE: not allowed in type signatures
+//~| HELP: replace with the correct type
+
+
+// FIXME: this should also suggest a function pointer, as the closure is non-capturing
+const C: _ = || 42;
+//~^ ERROR: the type placeholder `_` is not allowed within types on item signatures
+//~| NOTE: not allowed in type signatures
+//~| NOTE: however, the inferred type
+
+struct S<T> { t: T }
+const D = S { t: { let i = 0; move || -> i32 { i } } };
+//~^ ERROR: missing type for `const` item
+//~| NOTE: however, the inferred type
+
+
+fn foo() -> i32 { 42 }
+const E = foo;
+//~^ ERROR: missing type for `const` item
+//~| HELP: provide a type for the item
+const F = S { t: foo };
+//~^ ERROR: missing type for `const` item
+//~| HELP: provide a type for the item
+
+
+const G = || -> i32 { yield 0; return 1; };
+//~^ ERROR: missing type for `const` item
+//~| NOTE: however, the inferred type
diff --git a/src/test/ui/suggestions/unnamable-types.stderr b/src/test/ui/suggestions/unnamable-types.stderr
new file mode 100644
index 00000000000..2c8166781bf
--- /dev/null
+++ b/src/test/ui/suggestions/unnamable-types.stderr
@@ -0,0 +1,66 @@
+error: missing type for `const` item
+  --> $DIR/unnamable-types.rs:6:7
+   |
+LL | const A = 5;
+   |       ^ help: provide a type for the item: `A: i32`
+
+error[E0121]: the type placeholder `_` is not allowed within types on item signatures
+  --> $DIR/unnamable-types.rs:10:11
+   |
+LL | static B: _ = "abc";
+   |           ^
+   |           |
+   |           not allowed in type signatures
+   |           help: replace with the correct type: `&str`
+
+error[E0121]: the type placeholder `_` is not allowed within types on item signatures
+  --> $DIR/unnamable-types.rs:17:10
+   |
+LL | const C: _ = || 42;
+   |          ^ not allowed in type signatures
+   |
+note: however, the inferred type `[closure@$DIR/unnamable-types.rs:17:14: 17:19]` cannot be named
+  --> $DIR/unnamable-types.rs:17:14
+   |
+LL | const C: _ = || 42;
+   |              ^^^^^
+
+error: missing type for `const` item
+  --> $DIR/unnamable-types.rs:23:7
+   |
+LL | const D = S { t: { let i = 0; move || -> i32 { i } } };
+   |       ^
+   |
+note: however, the inferred type `S<[closure@$DIR/unnamable-types.rs:23:31: 23:51]>` cannot be named
+  --> $DIR/unnamable-types.rs:23:11
+   |
+LL | const D = S { t: { let i = 0; move || -> i32 { i } } };
+   |           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+error: missing type for `const` item
+  --> $DIR/unnamable-types.rs:29:7
+   |
+LL | const E = foo;
+   |       ^ help: provide a type for the item: `E: fn() -> i32`
+
+error: missing type for `const` item
+  --> $DIR/unnamable-types.rs:32:7
+   |
+LL | const F = S { t: foo };
+   |       ^ help: provide a type for the item: `F: S<fn() -> i32>`
+
+error: missing type for `const` item
+  --> $DIR/unnamable-types.rs:37:7
+   |
+LL | const G = || -> i32 { yield 0; return 1; };
+   |       ^
+   |
+note: however, the inferred type `[generator@$DIR/unnamable-types.rs:37:11: 37:43 {i32, ()}]` cannot be named
+  --> $DIR/unnamable-types.rs:37:11
+   |
+LL | const G = || -> i32 { yield 0; return 1; };
+   |           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+error: aborting due to 7 previous errors
+
+For more information about this error, try `rustc --explain E0121`.