Add tests for const, static, type alias, enum, and method

.cargo/config

@@ -4,3 +4,4 @@ dev = "run --target-dir clippy_dev/target --package clippy_dev --bin clippy_dev
 
 [build]
 rustflags = ["-Zunstable-options"]
+rustc-wrapper = ""

tests/ui/zero_sized_map_values.rs

@@ -1,6 +1,20 @@
 #![warn(clippy::zero_sized_map_values)]
 use std::collections::HashMap;
 
+const CONST_OK: Option<HashMap<String, usize>> = None;
+const CONST_NOT_OK: Option<HashMap<String, ()>> = None;
+
+static STATIC_OK: Option<HashMap<String, usize>> = None;
+static STATIC_NOT_OK: Option<HashMap<String, ()>> = None;
+
+type OkMap = HashMap<String, usize>;
+type NotOkMap = HashMap<String, ()>;
+
+enum TestEnum {
+    Ok(HashMap<String, usize>),
+    NotOk(HashMap<String, ()>),
+}
+
 struct Test {
     ok: HashMap<String, usize>,
     not_ok: HashMap<String, ()>,
@@ -16,6 +30,16 @@ trait TestTrait {
     fn weird_map(&self, map: HashMap<usize, ()>);
 }
 
+impl Test {
+    fn ok(&self) -> HashMap<String, usize> {
+        todo!()
+    }
+
+    fn not_ok(&self) -> HashMap<String, ()> {
+        todo!()
+    }
+}
+
 impl TestTrait for Test {
     type Output = HashMap<String, ()>;
 

tests/ui/zero_sized_map_values.stderr

@@ -1,59 +1,107 @@
 error: map with zero-sized value type
-  --> $DIR/zero_sized_map_values.rs:6:13
+  --> $DIR/zero_sized_map_values.rs:5:28
+   |
+LL | const CONST_NOT_OK: Option<HashMap<String, ()>> = None;
+   |                            ^^^^^^^^^^^^^^^^^^^
+   |
+   = note: `-D clippy::zero-sized-map-values` implied by `-D warnings`
+   = help: consider using a set instead
+
+error: map with zero-sized value type
+  --> $DIR/zero_sized_map_values.rs:8:30
+   |
+LL | static STATIC_NOT_OK: Option<HashMap<String, ()>> = None;
+   |                              ^^^^^^^^^^^^^^^^^^^
+   |
+   = help: consider using a set instead
+
+error: map with zero-sized value type
+  --> $DIR/zero_sized_map_values.rs:11:17
+   |
+LL | type NotOkMap = HashMap<String, ()>;
+   |                 ^^^^^^^^^^^^^^^^^^^
+   |
+   = help: consider using a set instead
+
+error: map with zero-sized value type
+  --> $DIR/zero_sized_map_values.rs:15:11
+   |
+LL |     NotOk(HashMap<String, ()>),
+   |           ^^^^^^^^^^^^^^^^^^^
+   |
+   = help: consider using a set instead
+
+error: map with zero-sized value type
+  --> $DIR/zero_sized_map_values.rs:20:13
    |
 LL |     not_ok: HashMap<String, ()>,
    |             ^^^^^^^^^^^^^^^^^^^
    |
-   = note: `-D clippy::zero-sized-map-values` implied by `-D warnings`
    = help: consider using a set instead
 
 error: map with zero-sized value type
-  --> $DIR/zero_sized_map_values.rs:8:22
+  --> $DIR/zero_sized_map_values.rs:22:22
    |
 LL |     also_not_ok: Vec<HashMap<usize, ()>>,
    |                      ^^^^^^^^^^^^^^^^^^
    |
    = help: consider using a set instead
 
 error: map with zero-sized value type
-  --> $DIR/zero_sized_map_values.rs:16:30
+  --> $DIR/zero_sized_map_values.rs:30:30
    |
 LL |     fn weird_map(&self, map: HashMap<usize, ()>);
    |                              ^^^^^^^^^^^^^^^^^^
    |
    = help: consider using a set instead
 
 error: map with zero-sized value type
-  --> $DIR/zero_sized_map_values.rs:31:14
+  --> $DIR/zero_sized_map_values.rs:38:25
+   |
+LL |     fn not_ok(&self) -> HashMap<String, ()> {
+   |                         ^^^^^^^^^^^^^^^^^^^
+   |
+   = help: consider using a set instead
+
+error: map with zero-sized value type
+  --> $DIR/zero_sized_map_values.rs:55:14
    |
 LL | fn test(map: HashMap<String, ()>, key: &str) -> HashMap<String, ()> {
    |              ^^^^^^^^^^^^^^^^^^^
    |
    = help: consider using a set instead
 
 error: map with zero-sized value type
-  --> $DIR/zero_sized_map_values.rs:31:49
+  --> $DIR/zero_sized_map_values.rs:55:49
    |
 LL | fn test(map: HashMap<String, ()>, key: &str) -> HashMap<String, ()> {
    |                                                 ^^^^^^^^^^^^^^^^^^^
    |
    = help: consider using a set instead
 
 error: map with zero-sized value type
-  --> $DIR/zero_sized_map_values.rs:41:9
+  --> $DIR/zero_sized_map_values.rs:65:9
    |
 LL |     let _: HashMap<String, ()> = HashMap::new();
    |         ^
    |
    = help: consider using a set instead
 
 error: map with zero-sized value type
-  --> $DIR/zero_sized_map_values.rs:44:9
+  --> $DIR/zero_sized_map_values.rs:65:12
+   |
+LL |     let _: HashMap<String, ()> = HashMap::new();
+   |            ^^^^^^^^^^^^^^^^^^^
+   |
+   = help: consider using a set instead
+
+error: map with zero-sized value type
+  --> $DIR/zero_sized_map_values.rs:68:9
    |
 LL |     let _: HashMap<_, _> = std::iter::empty::<(String, ())>().collect();
    |         ^
    |
    = help: consider using a set instead
 
-error: aborting due to 7 previous errors
+error: aborting due to 13 previous errors