fix: no complete keyword colons before colons

crates/ide-completion/src/completions.rs

@@ -97,11 +97,30 @@ impl Completions {
         item.add_to(self, ctx.db);
     }
 
+    pub(crate) fn add_keyword_with_colon(
+        &mut self,
+        ctx: &CompletionContext<'_, '_>,
+        keyword: &'static str,
+    ) {
+        debug_assert!(!keyword.ends_with("::"));
+        let label = syntax::format_smolstr!("{keyword}::");
+        let mut item = CompletionItem::new(
+            CompletionItemKind::Keyword,
+            ctx.source_range(),
+            label.clone(),
+            ctx.edition,
+        );
+        if ctx.token.next_token().is_some_and(|it| it.kind() == syntax::T![::]) {
+            item.insert_text(keyword);
+        }
+        item.add_to(self, ctx.db);
+    }
+
     pub(crate) fn add_nameref_keywords_with_colon(&mut self, ctx: &CompletionContext<'_, '_>) {
-        ["self::", "crate::"].into_iter().for_each(|kw| self.add_keyword(ctx, kw));
+        ["self", "crate"].into_iter().for_each(|kw| self.add_keyword_with_colon(ctx, kw));
 
         if ctx.depth_from_crate_root > 0 {
-            self.add_keyword(ctx, "super::");
+            self.add_keyword_with_colon(ctx, "super");
         }
     }
 
@@ -152,7 +171,7 @@ impl Completions {
             && len > 0
             && len < ctx.depth_from_crate_root
         {
-            self.add_keyword(ctx, "super::");
+            self.add_keyword_with_colon(ctx, "super");
         }
     }
 

crates/ide-completion/src/render.rs

@@ -622,12 +622,18 @@ pub(crate) fn render_type_keyword_snippet(
     ctx: &CompletionContext<'_, '_>,
     path_ctx: &PathCompletionCtx<'_>,
     label: &str,
-    snippet: &str,
+    mut snippet: &str,
 ) -> Builder {
     let source_range = ctx.source_range();
     let mut item =
         CompletionItem::new(CompletionItemKind::Keyword, source_range, label, ctx.edition);
 
+    if let Some(keyword) = snippet.strip_suffix("::")
+        && ctx.token.next_token().is_some_and(|it| it.kind() == syntax::T![::])
+    {
+        snippet = keyword;
+    }
+
     let insert_text = if !snippet.contains('$') {
         item.insert_text(snippet);
         snippet

crates/ide-completion/src/tests/expression.rs

@@ -1193,6 +1193,29 @@ fn foo() { i!(module) }"#,
     );
 }
 
+#[test]
+fn complete_self_kw() {
+    check_edit("self::", r#"fn foo() { $0 }"#, r#"fn foo() { self:: }"#);
+
+    check_edit("self::", r#"fn foo() -> $0 {}"#, r#"fn foo() -> self:: {}"#);
+
+    check_edit("self::", r#"fn foo() { $0::bar }"#, r#"fn foo() { self::bar }"#);
+
+    check_edit("self::", r#"fn foo() -> $0::bar {}"#, r#"fn foo() -> self::bar {}"#);
+
+    check_edit("self::", r#"fn foo() { $0bar::baz }"#, r#"fn foo() { self::bar::baz }"#);
+
+    check_edit(
+        "self::",
+        r#"
+macro_rules! i { ($i:ident) => { $i::bar } }
+fn foo() { i!($0) }"#,
+        r#"
+macro_rules! i { ($i:ident) => { $i::bar } }
+fn foo() { i!(self) }"#,
+    );
+}
+
 #[test]
 fn else_completion_after_if() {
     check(