don't report unknown/any errors when casting

packages/pyright-internal/src/analyzer/typeEvaluator.ts

@@ -5305,7 +5305,7 @@ export function createTypeEvaluator(
         }
 
         // See if we need to log an "unknown member access" diagnostic.
-        let skipPartialUnknownCheck = typeResult.isIncomplete;
+        let skipPartialUnknownCheck = typeResult.isIncomplete || flags & EvalFlags.AllowAnyOrUnknown;
 
         // Don't report an error if the type is a partially-specialized
         // class being passed as an argument. This comes up frequently in
@@ -10269,7 +10269,8 @@ export function createTypeEvaluator(
         let castFromType = getTypeOfArgument(
             argList[1],
             /* inferenceContext */ undefined,
-            /* signatureTracker */ undefined
+            /* signatureTracker */ undefined,
+            EvalFlags.AllowAnyOrUnknown
         ).type;
 
         if (castFromType.props?.specialForm) {
@@ -20767,7 +20768,8 @@ export function createTypeEvaluator(
     function getTypeOfArgument(
         arg: FunctionArgument,
         inferenceContext: InferenceContext | undefined,
-        signatureTracker: UniqueSignatureTracker | undefined
+        signatureTracker: UniqueSignatureTracker | undefined,
+        flags: EvalFlags = EvalFlags.None
     ): TypeResult {
         if (arg.typeResult) {
             const type = arg.typeResult.type;
@@ -20781,12 +20783,7 @@ export function createTypeEvaluator(
 
         // If there was no defined type provided, there should always
         // be a value expression from which we can retrieve the type.
-        const typeResult = getTypeOfExpression(
-            arg.valueExpression,
-            /* flags */ undefined,
-            inferenceContext,
-            signatureTracker
-        );
+        const typeResult = getTypeOfExpression(arg.valueExpression, flags, inferenceContext, signatureTracker);
 
         if (signatureTracker) {
             typeResult.type = ensureFunctionSignaturesAreUnique(

packages/pyright-internal/src/analyzer/typeEvaluatorTypes.ts

@@ -162,6 +162,9 @@ export const enum EvalFlags {
     // with the second argument to isinstance and issubclass calls.
     IsinstanceArg = 1 << 29,
 
+    /** don't report an error if the type is `Any` or "Unknown" */
+    AllowAnyOrUnknown = 1 << 30,
+
     // Defaults used for evaluating the LHS of a call expression.
     CallBaseDefaults = NoSpecialize,
 

packages/pyright-internal/src/tests/samples/reportAny.py

@@ -1,4 +1,4 @@
-from typing import Any, Callable
+from typing import Any, Callable, cast
 
 
 def foo(bar: Any) -> Any:
@@ -17,4 +17,7 @@ def baz() -> None: ...
 
 match(bar):
     case _:
-        ...
+        ...
+
+cast(int, bar)
+cast(int, bar.asdf)