Mark string prefixes and suffixes as unsupported

compiler/testData/diagnostics/tests/StringPrefixAndSuffix.kt

@@ -0,0 +1,39 @@
+// !DIAGNOSTICS: -UNUSED_PARAMETER
+
+infix fun Any?.foo(a: Any) {}
+operator fun Any?.contains(a: Any): Boolean = true
+
+fun test(a: Any) {
+
+    a <!UNSUPPORTED!>foo<!>""
+    a <!UNSUPPORTED!>foo<!>"asd"
+    a <!UNSUPPORTED!>foo<!>"$a"
+    a <!UNSUPPORTED!>foo<!>"asd${a}sfsa"
+    a <!UNSUPPORTED!>foo<!>"""sdf"""
+    a <!UNSUPPORTED!>foo<!>'d'
+    a <!UNSUPPORTED!>foo<!><!EMPTY_CHARACTER_LITERAL!>''<!>
+
+    a <!UNSUPPORTED!>foo<!>""<!UNSUPPORTED!>foo<!> a
+    a <!UNSUPPORTED!>foo<!>"asd"<!UNSUPPORTED!>foo<!> a
+    a <!UNSUPPORTED!>foo<!>"$a"<!UNSUPPORTED!>foo<!> a
+    a <!UNSUPPORTED!>foo<!>"asd${a}sfsa"<!UNSUPPORTED!>foo<!> a
+    a <!UNSUPPORTED!>foo<!>"""sdf"""<!UNSUPPORTED!>foo<!> a
+    a <!UNSUPPORTED!>foo<!>'d'<!UNSUPPORTED!>foo<!> a
+    a <!UNSUPPORTED!>foo<!><!EMPTY_CHARACTER_LITERAL!>''<!><!UNSUPPORTED!>foo<!> a
+
+    a <!UNSUPPORTED!>in<!>"foo"
+    a <!UNSUPPORTED!>in<!>"""foo"""
+    a <!UNSUPPORTED!>in<!>'s'
+    a <!UNSUPPORTED!>in<!><!EMPTY_CHARACTER_LITERAL!>''<!>
+
+    a <!UNSUPPORTED!>!in<!>"foo"
+    a <!UNSUPPORTED!>!in<!>"""foo"""
+    a <!UNSUPPORTED!>!in<!>'s'
+    a <!UNSUPPORTED!>!in<!><!EMPTY_CHARACTER_LITERAL!>''<!>
+
+    if("s"<!UNSUPPORTED!>is<!> Any) {}
+    test("s"<!UNSUPPORTED!>as<!> Any)
+
+    a <!UNSUPPORTED!>foo<!>""<!UNSUPPORTED, SYNTAX!>1<!>
+    a <!UNSUPPORTED!>foo<!>""<!UNSUPPORTED, SYNTAX!>1.0<!>
+}

compiler/testData/diagnostics/tests/StringPrefixAndSuffix.txt

@@ -0,0 +1,5 @@
+package
+
+public fun test(/*0*/ a: kotlin.Any): kotlin.Unit
+public operator fun kotlin.Any?.contains(/*0*/ a: kotlin.Any): kotlin.Boolean
+public infix fun kotlin.Any?.foo(/*0*/ a: kotlin.Any): kotlin.Unit