internal: switch some tests to minicore

crates/ide/src/hover.rs

@@ -3000,29 +3000,24 @@ fn foo(ar$0g: &impl Foo + Bar<S>) {}
     fn test_hover_async_block_impl_trait_has_goto_type_action() {
         check_actions(
             r#"
+//- minicore: future
 struct S;
 fn foo() {
     let fo$0o = async { S };
 }
-
-#[prelude_import] use future::*;
-mod future {
-    #[lang = "future_trait"]
-    pub trait Future { type Output; }
-}
 "#,
             expect![[r#"
                 [
                     GoToType(
                         [
                             HoverGotoTypeData {
-                                mod_path: "test::future::Future",
+                                mod_path: "core::future::Future",
                                 nav: NavigationTarget {
                                     file_id: FileId(
-                                        0,
+                                        1,
                                     ),
-                                    full_range: 101..163,
+                                    full_range: 244..426,
-                                    focus_range: 140..146,
+                                    focus_range: 283..289,
                                     name: "Future",
                                     kind: Trait,
                                     description: "pub trait Future",

crates/ide_completion/src/render.rs

@@ -1152,16 +1152,11 @@ fn main() {
     fn suggest_deref() {
         check_relevance(
             r#"
-#[lang = "deref"]
+//- minicore: deref
-trait Deref {
-    type Target;
-    fn deref(&self) -> &Self::Target;
-}
-
 struct S;
 struct T(S);
 
-impl Deref for T {
+impl core::ops::Deref for T {
     type Target = S;
 
     fn deref(&self) -> &Self::Target {
@@ -1185,8 +1180,9 @@ fn main() {
                 st T []
                 st S []
                 fn main() []
-                tt Deref []
                 fn foo(…) []
+                md core []
+                tt Sized []
             "#]],
         )
     }