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-rw-r--r--crates/ide/src/hover.rs46
1 files changed, 43 insertions, 3 deletions
diff --git a/crates/ide/src/hover.rs b/crates/ide/src/hover.rs
index 832192881..94ad800a0 100644
--- a/crates/ide/src/hover.rs
+++ b/crates/ide/src/hover.rs
@@ -139,14 +139,17 @@ pub(crate) fn hover(
139 } 139 }
140 } 140 }
141 141
142 let node = token 142 let node = token.ancestors().find(|n| {
143 .ancestors() 143 ast::Expr::can_cast(n.kind())
144 .find(|n| ast::Expr::cast(n.clone()).is_some() || ast::Pat::cast(n.clone()).is_some())?; 144 || ast::Pat::can_cast(n.kind())
145 || ast::SelfParam::can_cast(n.kind())
146 })?;
145 147
146 let ty = match_ast! { 148 let ty = match_ast! {
147 match node { 149 match node {
148 ast::Expr(it) => sema.type_of_expr(&it)?, 150 ast::Expr(it) => sema.type_of_expr(&it)?,
149 ast::Pat(it) => sema.type_of_pat(&it)?, 151 ast::Pat(it) => sema.type_of_pat(&it)?,
152 ast::SelfParam(self_param) => sema.type_of_self(&self_param)?,
150 // If this node is a MACRO_CALL, it means that `descend_into_macros` failed to resolve. 153 // If this node is a MACRO_CALL, it means that `descend_into_macros` failed to resolve.
151 // (e.g expanding a builtin macro). So we give up here. 154 // (e.g expanding a builtin macro). So we give up here.
152 ast::MacroCall(_it) => return None, 155 ast::MacroCall(_it) => return None,
@@ -3282,4 +3285,41 @@ fn main() {
3282 "#]], 3285 "#]],
3283 ); 3286 );
3284 } 3287 }
3288
3289 #[test]
3290 fn hover_self_param_shows_type() {
3291 check(
3292 r#"
3293struct Foo {}
3294impl Foo {
3295 fn bar(&sel<|>f) {}
3296}
3297"#,
3298 expect![[r#"
3299 *&self*
3300 ```rust
3301 &Foo
3302 ```
3303 "#]],
3304 );
3305 }
3306
3307 #[test]
3308 fn hover_self_param_shows_type_for_arbitrary_self_type() {
3309 check(
3310 r#"
3311struct Arc<T>(T);
3312struct Foo {}
3313impl Foo {
3314 fn bar(sel<|>f: Arc<Foo>) {}
3315}
3316"#,
3317 expect![[r#"
3318 *self: Arc<Foo>*
3319 ```rust
3320 Arc<Foo>
3321 ```
3322 "#]],
3323 );
3324 }
3285} 3325}