2 files changed, 25 insertions, 2 deletions
diff --git a/tests/ui/generics/generic-type-less-params-with-defaults.rs b/tests/ui/generics/generic-type-less-params-with-defaults.rs
index 6b877ab8aee..b0952a26332 100644
--- a/tests/ui/generics/generic-type-less-params-with-defaults.rs
+++ b/tests/ui/generics/generic-type-less-params-with-defaults.rs
@@ -5,7 +5,14 @@ struct Heap;
 struct Vec<T, A = Heap>(
     marker::PhantomData<(T,A)>);
 
+struct HashMap<K, V, S = ()>(marker::PhantomData<(K,V,S)>);
+
 fn main() {
     let _: Vec;
     //~^ ERROR missing generics for struct `Vec`
+    //~| SUGGESTION <T>
+
+    let _x = (1..10).collect::<HashMap>();
+    //~^ ERROR missing generics for struct `HashMap`
+    //~| SUGGESTION <_, _>
 }
diff --git a/tests/ui/generics/generic-type-less-params-with-defaults.stderr b/tests/ui/generics/generic-type-less-params-with-defaults.stderr
index 6f79b09f6cd..43956237e4c 100644
--- a/tests/ui/generics/generic-type-less-params-with-defaults.stderr
+++ b/tests/ui/generics/generic-type-less-params-with-defaults.stderr
@@ -1,5 +1,5 @@
 error[E0107]: missing generics for struct `Vec`
-  --> $DIR/generic-type-less-params-with-defaults.rs:9:12
+  --> $DIR/generic-type-less-params-with-defaults.rs:11:12
    |
 LL |     let _: Vec;
    |            ^^^ expected at least 1 generic argument
@@ -14,6 +14,22 @@ help: add missing generic argument
 LL |     let _: Vec<T>;
    |               +++
 
-error: aborting due to 1 previous error
+error[E0107]: missing generics for struct `HashMap`
+  --> $DIR/generic-type-less-params-with-defaults.rs:15:32
+   |
+LL |     let _x = (1..10).collect::<HashMap>();
+   |                                ^^^^^^^ expected at least 2 generic arguments
+   |
+note: struct defined here, with at least 2 generic parameters: `K`, `V`
+  --> $DIR/generic-type-less-params-with-defaults.rs:8:8
+   |
+LL | struct HashMap<K, V, S = ()>(marker::PhantomData<(K,V,S)>);
+   |        ^^^^^^^ -  -
+help: add missing generic arguments
+   |
+LL |     let _x = (1..10).collect::<HashMap<_, _>>();
+   |                                       ++++++
+
+error: aborting due to 2 previous errors
 
 For more information about this error, try `rustc --explain E0107`.