Resolve generic false positives in the MissingReturn check.

Author: xuhuanzy

crates/emmylua_code_analysis/src/diagnostic/checker/check_return_count.rs

@@ -82,6 +82,8 @@ fn check_missing_return(
                     if let Some(ty) = variadic.get_type(i) {
                         if ty.is_optional() {
                             real_min_len -= 1;
+                        } else if ty.is_tpl() {
+                            real_min_len -= 1;
                         } else {
                             break;
                         }

crates/emmylua_code_analysis/src/diagnostic/test/check_return_count_test.rs

@@ -496,4 +496,16 @@ mod tests {
         "#,
         ));
     }
+
+    #[test]
+    fn test_pcall_missing_return() {
+        let mut ws = VirtualWorkspace::new_with_init_std_lib();
+
+        assert!(ws.check_code_for(
+            DiagnosticCode::MissingReturn,
+            r#"
+                pcall(function() end)
+        "#,
+        ));
+    }
 }