fix: LSP code action wasn't triggering on beginning or end of identifier

compiler/noirc_errors/src/position.rs

@@ -94,8 +94,10 @@ impl Span {
         self.start() <= other.start() && self.end() >= other.end()
     }
 
+    /// Returns `true` if any point of `self` intersects a point of `other`.
+    /// Adjacent spans are considered to intersect (so, for example, `0..1` intersects `1..3`).
     pub fn intersects(&self, other: &Span) -> bool {
-        self.end() > other.start() && self.start() < other.end()
+        self.end() >= other.start() && self.start() <= other.end()
     }
 
     pub fn is_smaller(&self, other: &Span) -> bool {
@@ -140,3 +142,37 @@ impl Location {
         self.file == other.file && self.span.contains(&other.span)
     }
 }
+
+#[cfg(test)]
+mod tests {
+    use crate::Span;
+
+    #[test]
+    fn test_intersects() {
+        assert!(Span::from(5..10).intersects(&Span::from(5..10)));
+
+        assert!(Span::from(5..10).intersects(&Span::from(5..5)));
+        assert!(Span::from(5..5).intersects(&Span::from(5..10)));
+
+        assert!(Span::from(10..10).intersects(&Span::from(5..10)));
+        assert!(Span::from(5..10).intersects(&Span::from(10..10)));
+
+        assert!(Span::from(5..10).intersects(&Span::from(6..9)));
+        assert!(Span::from(6..9).intersects(&Span::from(5..10)));
+
+        assert!(Span::from(5..10).intersects(&Span::from(4..11)));
+        assert!(Span::from(4..11).intersects(&Span::from(5..10)));
+
+        assert!(Span::from(5..10).intersects(&Span::from(4..6)));
+        assert!(Span::from(4..6).intersects(&Span::from(5..10)));
+
+        assert!(Span::from(5..10).intersects(&Span::from(9..11)));
+        assert!(Span::from(9..11).intersects(&Span::from(5..10)));
+
+        assert!(!Span::from(5..10).intersects(&Span::from(3..4)));
+        assert!(!Span::from(3..4).intersects(&Span::from(5..10)));
+
+        assert!(!Span::from(5..10).intersects(&Span::from(11..12)));
+        assert!(!Span::from(11..12).intersects(&Span::from(5..10)));
+    }
+}

tooling/lsp/src/requests/code_action/import_or_qualify.rs

@@ -183,6 +183,31 @@ mod foo {
     }
 }
 
+fn foo(x: SomeTypeInBar) {}"#;
+
+        assert_code_action(title, src, expected).await;
+    }
+
+    #[test]
+    async fn test_import_code_action_for_struct_at_beginning_of_name() {
+        let title = "Import foo::bar::SomeTypeInBar";
+
+        let src = r#"mod foo {
+    pub mod bar {
+        pub struct SomeTypeInBar {}
+    }
+}
+
+fn foo(x: >|<SomeTypeInBar) {}"#;
+
+        let expected = r#"use foo::bar::SomeTypeInBar;
+
+mod foo {
+    pub mod bar {
+        pub struct SomeTypeInBar {}
+    }
+}
+
 fn foo(x: SomeTypeInBar) {}"#;
 
         assert_code_action(title, src, expected).await;