Regression test #KT-7804 Obsolete

compiler/testData/diagnostics/tests/regressions/kt7804.kt

@@ -0,0 +1,64 @@
+// See also KT-7804 (Wrong type inference of kotlin.Any? was for 'a' without explicit type)
+fun <T> foo(a: T) = a
+
+class A
+
+fun <T> test(v: T): T {
+    val a = if (v !is A) {
+        foo(v) <!USELESS_CAST!>as T<!>
+    }
+    else {
+        v
+    }
+
+    val t: T = a
+    return t
+}
+
+fun <T> test2(v: T): T {
+    val a = if (v !is A) {
+        foo(v) <!USELESS_CAST!>as T<!>
+    }
+    else {
+        v <!USELESS_CAST!>as T<!>
+    }
+
+    val t: T = a
+    return t
+}
+
+fun <T> test3(v: T): T {
+    val a = if (v !is A) {
+        foo(v)
+    }
+    else {
+        v
+    }
+
+    val t: T = a
+    return t
+}
+
+fun <T> test4(v: T): T {
+    val a: T = if (v !is A) {
+        foo(v) <!USELESS_CAST!>as T<!>
+    }
+    else {
+        v
+    }
+
+    val t: T = a
+    return t
+}
+
+fun <T> test5(v: T): T {
+    val a: T = if (v !is A) {
+        foo(v)
+    }
+    else {
+        v
+    }
+
+    val t: T = a
+    return t
+}