From a109484776ab8870db32fc08b9f387c2b8e8a6e9 Mon Sep 17 00:00:00 2001
From: Eric Traut <erictr@microsoft.com>
Date: Sat, 21 Sep 2019 20:29:13 -0700
Subject: [PATCH] Handled case where base type of call expression evaluates to
 a TypeVar type.

---
 server/src/analyzer/expressionEvaluator.ts | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/server/src/analyzer/expressionEvaluator.ts b/server/src/analyzer/expressionEvaluator.ts
index 81b21a4a1889..e2bc0e8af946 100644
--- a/server/src/analyzer/expressionEvaluator.ts
+++ b/server/src/analyzer/expressionEvaluator.ts
@@ -1615,7 +1615,11 @@ export class ExpressionEvaluator {
             specializeReturnType = true): TypeResult {
 
         let type: Type | undefined;
-        const callType = baseTypeResult.type;
+        let callType = baseTypeResult.type;
+
+        if (callType.category === TypeCategory.TypeVar) {
+            callType = TypeUtils.specializeType(callType, undefined);
+        }
 
         if (callType.category === TypeCategory.Class) {
             if (ClassType.isBuiltIn(callType)) {