Merge #6769

6769: Add native "remove this semicolon" diagnostics r=matklad a=ivan770

Closes #6739 
![demo2](https://user-images.githubusercontent.com/14003886/101530533-b76c3180-399a-11eb-9d18-5c8457721655.gif)


Co-authored-by: ivan770 <[email protected]>

1 files changed, 24 insertions, 0 deletions

diff --git a/crates/hir_ty/src/diagnostics.rs b/crates/hir_ty/src/diagnostics.rs
index b58fe0ed7..e59487e54 100644
--- a/crates/hir_ty/src/diagnostics.rs
+++ b/crates/hir_ty/src/diagnostics.rs
@@ -216,6 +216,30 @@ impl Diagnostic for MissingOkInTailExpr {
     }
 }
 
+#[derive(Debug)]
+pub struct RemoveThisSemicolon {
+    pub file: HirFileId,
+    pub expr: AstPtr<ast::Expr>,
+}
+
+impl Diagnostic for RemoveThisSemicolon {
+    fn code(&self) -> DiagnosticCode {
+        DiagnosticCode("remove-this-semicolon")
+    }
+
+    fn message(&self) -> String {
+        "Remove this semicolon".to_string()
+    }
+
+    fn display_source(&self) -> InFile<SyntaxNodePtr> {
+        InFile { file_id: self.file, value: self.expr.clone().into() }
+    }
+
+    fn as_any(&self) -> &(dyn Any + Send + 'static) {
+        self
+    }
+}
+
 // Diagnostic: break-outside-of-loop
 //
 // This diagnostic is triggered if `break` keyword is used outside of a loop.