TEST: Add test for scoping issue

See #2146

Author: ubaidsk

integration_tests/CMakeLists.txt

@@ -423,6 +423,7 @@ RUN(NAME expr_16             LABELS cpython c)
 RUN(NAME expr_17             LABELS cpython llvm c)
 RUN(NAME expr_18    FAIL     LABELS cpython llvm c)
 RUN(NAME expr_19             LABELS cpython llvm c)
+RUN(NAME expr_20             LABELS cpython llvm c)
 
 RUN(NAME expr_01u            LABELS cpython llvm c NOFAST)
 RUN(NAME expr_02u            LABELS cpython llvm c NOFAST)

integration_tests/expr_20.py

@@ -0,0 +1,16 @@
+from lpython import i16, i32
+
+def f():
+    i: i32 = 5
+    print(i16(i % 1023))
+
+def u16(x: i16) -> i32:
+    if x >= i16(0):
+        return i32(x)
+    else:
+        return i32(x) + 65536
+
+f()
+print(u16(i16(10)), u16(i16(-10)))
+assert(u16(i16(10)) == 10)
+assert(u16(i16(-10)) == 65526)