[FE] KT-50878 Prohibit using contextual declarations without -Xcontext-receivers

compiler/testData/diagnostics/tests/extensions/contextReceivers/unsupported.fir.kt

@@ -5,6 +5,17 @@ fun f(g: context(Any) () -> Unit, value: Any): context(A) () -> Unit {
     return value as (context(A) () -> Unit)
 }
 
+fun f(g: () -> Unit, value: Any) : () -> Unit {
+    return g
+}
+
+context(Any)
+fun sameAsFWithoutNonContextualCounterpart(g: () -> Unit, value: Any) : () -> Unit {
+    return g
+}
+
+context(Any) val p get() = 42
+
 context(String, Int)
 class A {
     context(Any)
@@ -12,4 +23,17 @@ class A {
 
     context(String, Int)
     fun m() {}
-}
+}
+
+fun useWithContextReceivers() {
+    with(42) {
+        with("") {
+            <!OVERLOAD_RESOLUTION_AMBIGUITY!>f<!>({}, 42)
+            sameAsFWithoutNonContextualCounterpart({}, 42)
+            p
+            val a = A()
+            a.p
+            a.m()
+        }
+    }
+}

compiler/testData/diagnostics/tests/extensions/contextReceivers/unsupported.kt

@@ -5,6 +5,17 @@ fun f(g: <!UNSUPPORTED_FEATURE!>context(Any)<!> () -> Unit, value: Any): <!UNSUP
     return value as (<!UNSUPPORTED_FEATURE!>context(A)<!> () -> Unit)
 }
 
+fun f(g: () -> Unit, value: Any) : () -> Unit {
+    return g
+}
+
+<!UNSUPPORTED_FEATURE!>context(Any)<!>
+fun sameAsFWithoutNonContextualCounterpart(g: () -> Unit, value: Any) : () -> Unit {
+    return g
+}
+
+<!UNSUPPORTED_FEATURE!>context(Any)<!> val p get() = 42
+
 <!UNSUPPORTED_FEATURE!>context(String, Int)<!>
 class A {
     <!UNSUPPORTED_FEATURE!>context(Any)<!>
@@ -12,4 +23,17 @@ class A {
 
     <!UNSUPPORTED_FEATURE!>context(String, Int)<!>
     fun m() {}
+}
+
+fun useWithContextReceivers() {
+    with(42) {
+        with("") {
+            f({}, 42)
+            <!UNSUPPORTED_CONTEXTUAL_DECLARATION_CALL!>sameAsFWithoutNonContextualCounterpart({}, 42)<!>
+            <!UNSUPPORTED_CONTEXTUAL_DECLARATION_CALL!>p<!>
+            val a = <!UNSUPPORTED_CONTEXTUAL_DECLARATION_CALL!>A()<!>
+            a.<!UNSUPPORTED_CONTEXTUAL_DECLARATION_CALL!>p<!>
+            a.<!UNSUPPORTED_CONTEXTUAL_DECLARATION_CALL!>m()<!>
+        }
+    }
 }

compiler/testData/diagnostics/tests/extensions/contextReceivers/unsupported.txt

@@ -1,6 +1,10 @@
 package
 
+context(kotlin.Any) public val p: kotlin.Int
+public fun f(/*0*/ g: () -> kotlin.Unit, /*1*/ value: kotlin.Any): () -> kotlin.Unit
 context(kotlin.Any) public fun f(/*0*/ g: context(kotlin.Any) () -> kotlin.Unit, /*1*/ value: kotlin.Any): context(A) () -> kotlin.Unit
+context(kotlin.Any) public fun sameAsFWithoutNonContextualCounterpart(/*0*/ g: () -> kotlin.Unit, /*1*/ value: kotlin.Any): () -> kotlin.Unit
+public fun useWithContextReceivers(): kotlin.Unit
 
 context(kotlin.String, kotlin.Int) public final class A {
     public constructor A()