[FIR] Implement ASSIGNMENT_TYPE_MISMATCH, RESULT_TYPE_MISMATCH diagnostics, fix tests

compiler/testData/diagnostics/tests/generics/capturedParameters/objectLiteral.fir.kt

@@ -13,7 +13,7 @@ class Q {
     private var y = foo<String>()
 
     fun bar() {
-        x = y
+        x = <!ASSIGNMENT_TYPE_MISMATCH!>y<!>
         x = foo<CharSequence>()
         y = foo<String>()
 

compiler/testData/diagnostics/tests/generics/innerClasses/iterator.fir.kt

@@ -29,7 +29,7 @@ fun <E> commonSupertype(x: E, y: E): E = x
 
 fun foo() {
     var myIt = A<String>().iterator()
-    myIt = A<Int>().iterator()
+    myIt = <!ASSIGNMENT_TYPE_MISMATCH!>A<Int>().iterator()<!>
 
     val csIt: Iterator<CharSequence> = A<String>().iterator()
 

compiler/testData/diagnostics/tests/generics/innerClasses/qualifiedOuter.fir.kt

@@ -11,7 +11,7 @@ class Outer<T> {
         z.checkType { _<Inner>() }
         z.checkType { _<Outer<T>.Inner>() }
 
-        inner = x
+        inner = <!ASSIGNMENT_TYPE_MISMATCH!>x<!>
     }
 
     class Nested

compiler/testData/diagnostics/tests/generics/nullability/smartCastsValueArgument.fir.kt

@@ -12,7 +12,7 @@ fun <T : CharSequence?> foo(x: T) {
         if (x != null) {}
 
         y1 = x
-        y2 = x
+        y2 = <!ASSIGNMENT_TYPE_MISMATCH!>x<!>
 
         bar1(x)
         bar1<CharSequence>(x)
@@ -31,7 +31,7 @@ fun <T : CharSequence?> foo(x: T) {
 
     if (x is CharSequence) {
         y1 = x
-        y2 = x
+        y2 = <!ASSIGNMENT_TYPE_MISMATCH!>x<!>
 
         bar1(x)
         bar2(x)

compiler/testData/diagnostics/tests/generics/nullability/tpInBounds.fir.kt

@@ -24,10 +24,10 @@ class A<T : CharSequence?, E1 : T, E2: T?> {
         }
 
         if (1 == 1) {
-            t = tN
+            t = <!ASSIGNMENT_TYPE_MISMATCH!>tN<!>
         }
 
-        t = y
+        t = <!ASSIGNMENT_TYPE_MISMATCH!>y<!>
 
         if (y != null) {
             t = y

compiler/testData/diagnostics/tests/generics/varProjection/setterNotProjectedOutAssign.fir.kt

@@ -5,6 +5,6 @@ interface Tr<T> {
 }
 
 fun test(t: Tr<*>) {
-    t.v = t
+    t.v = <!ASSIGNMENT_TYPE_MISMATCH!>t<!>
     t.v checkType { _<Tr<*>>() }
-}
+}

compiler/testData/diagnostics/tests/generics/varProjection/setterProjectedOutAssign.fir.kt

@@ -8,7 +8,7 @@ interface Tr<T> {
 
 fun test(t: Tr<*>) {
     t.v = null!!
-    t.v = ""
+    t.v = <!ASSIGNMENT_TYPE_MISMATCH!>""<!>
     t.v = <!NULL_FOR_NONNULL_TYPE!>null<!>
     t.v checkType { _<Any?>() }
-}
+}

compiler/testData/diagnostics/tests/generics/varProjection/setterProjectedOutNoPlusAssign.fir.kt

@@ -7,5 +7,5 @@ interface Tr<T> {
 fun test(t: Tr<out String>) {
     // resolved as t.v = t.v + null!!, where type of right operand is String,
     // so TYPE_MISMATCH: String is not <: of Captured(out String)
-    t.v += null!!
-}
+    <!ASSIGNMENT_TYPE_MISMATCH!>t.v += null!!<!>
+}