[FIR-TEST] Add new testdata generated after changes in previous commit

compiler/testData/diagnostics/tests/InfixModifierApplicability.fir.kt

@@ -0,0 +1,27 @@
+// !DIAGNOSTICS: -UNUSED_PARAMETER
+
+class Pair<A, B>(val a: A, val b: B)
+infix fun <A, B> A.to(that: B): Pair<A, B> = Pair(this, that)
+
+// OK
+infix fun String.ok1(o: String) {}
+class OkTest {
+    <!INAPPLICABLE_INFIX_MODIFIER!>infix fun ok2(o: String) {}<!>
+    infix fun String.ok3(o: String) {}
+}
+
+// Errors
+<!INAPPLICABLE_INFIX_MODIFIER!>infix fun String.e1(o: String, o2: String? = null) = o<!>
+<!INAPPLICABLE_INFIX_MODIFIER!>infix fun String.e2(o: String = "", o2: String? = null) = o<!>
+
+<!INAPPLICABLE_INFIX_MODIFIER!>infix fun e3() {}<!>
+<!INAPPLICABLE_INFIX_MODIFIER!>infix fun e4(s: String) {}<!>
+<!INAPPLICABLE_INFIX_MODIFIER!>infix fun String.e5() {}<!>
+<!INAPPLICABLE_INFIX_MODIFIER!>infix fun String.e6(a: Int, b: Int) {}<!>
+<!INAPPLICABLE_INFIX_MODIFIER!>infix fun e7(a: Int, b: Int) {}<!>
+
+class Example {
+    <!INAPPLICABLE_INFIX_MODIFIER!>infix fun e8(s: String, a: Int = 0) {}<!>
+    <!INAPPLICABLE_INFIX_MODIFIER!>infix fun e9(s: String, a: Int) {}<!>
+    <!INAPPLICABLE_INFIX_MODIFIER!>infix fun e10() {}<!>
+}