From 63ce2c7b5fd96e6688796f2ddd1cd7316df8d11d Mon Sep 17 00:00:00 2001
From: Jonas Schievink <jonas.schievink@ferrous-systems.com>
Date: Wed, 8 Jul 2020 19:58:45 +0200
Subject: Add argument count mismatch diagnostic

---
 crates/ra_hir_ty/src/diagnostics.rs | 29 +++++++++++++++++++++++++++++
 1 file changed, 29 insertions(+)

(limited to 'crates/ra_hir_ty/src/diagnostics.rs')

diff --git a/crates/ra_hir_ty/src/diagnostics.rs b/crates/ra_hir_ty/src/diagnostics.rs
index 0289911de..daac669e6 100644
--- a/crates/ra_hir_ty/src/diagnostics.rs
+++ b/crates/ra_hir_ty/src/diagnostics.rs
@@ -197,3 +197,32 @@ impl AstDiagnostic for MissingUnsafe {
         ast::Expr::cast(node).unwrap()
     }
 }
+
+#[derive(Debug)]
+pub struct MismatchedArgCount {
+    pub file: HirFileId,
+    pub call_expr: AstPtr<ast::Expr>,
+    pub expected: usize,
+    pub found: usize,
+}
+
+impl Diagnostic for MismatchedArgCount {
+    fn message(&self) -> String {
+        format!("Expected {} arguments, found {}", self.expected, self.found)
+    }
+    fn source(&self) -> InFile<SyntaxNodePtr> {
+        InFile { file_id: self.file, value: self.call_expr.clone().into() }
+    }
+    fn as_any(&self) -> &(dyn Any + Send + 'static) {
+        self
+    }
+}
+
+impl AstDiagnostic for MismatchedArgCount {
+    type AST = ast::CallExpr;
+    fn ast(&self, db: &dyn AstDatabase) -> Self::AST {
+        let root = db.parse_or_expand(self.source().file_id).unwrap();
+        let node = self.source().value.to_node(&root);
+        ast::CallExpr::cast(node).unwrap()
+    }
+}
-- 
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