[Analysis API] add regression test on error diagnostics for functional interfaces

^KT-63432 Obsolete

analysis/analysis-api/testData/components/diagnosticsProvider/diagnostics/errorsInFunctionalInterfacesInstances.descriptors.txt

@@ -0,0 +1,10 @@
+Diagnostics from elements:
+  for PSI element of type KtObjectDeclaration at (7,14-48)
+    ABSTRACT_MEMBER_NOT_IMPLEMENTED      text ranges: [(110,116)]
+      PSI: KtObjectDeclaration at (7,14-48)
+  for PSI element of type KtConstantExpression at (10,38-39)
+    CONSTANT_EXPECTED_TYPE_MISMATCH      text ranges: [(230,231)]
+      PSI: KtConstantExpression at (10,38-39)
+  for PSI element of type KtConstantExpression at (4,9-10)
+    CONSTANT_EXPECTED_TYPE_MISMATCH      text ranges: [(88,89)]
+      PSI: KtConstantExpression at (4,9-10)

analysis/analysis-api/testData/components/diagnosticsProvider/diagnostics/errorsInFunctionalInterfacesInstances.kt

@@ -0,0 +1,16 @@
+@Suppress("UNUSED_VARIABLE")
+fun check() {
+    val o = CustomSupplier<String> {
+        3
+    }
+
+    val o2 = object : CustomSupplier<String> {}
+
+    val o3 = object : CustomSupplier<String> {
+        override fun get(): String = 2
+    }
+}
+
+fun interface CustomSupplier<T> {
+    fun get(): T
+}

analysis/analysis-api/testData/components/diagnosticsProvider/diagnostics/errorsInFunctionalInterfacesInstances.txt

@@ -0,0 +1,10 @@
+Diagnostics from elements:
+  for PSI element of type KtObjectDeclaration at (7,14-48)
+    ABSTRACT_MEMBER_NOT_IMPLEMENTED      text ranges: [(110,116)]
+      PSI: KtObjectDeclaration at (7,14-48)
+  for PSI element of type KtConstantExpression at (4,9-10)
+    ARGUMENT_TYPE_MISMATCH      text ranges: [(88,89)]
+      PSI: KtConstantExpression at (4,9-10)
+  for PSI element of type KtConstantExpression at (10,38-39)
+    RETURN_TYPE_MISMATCH      text ranges: [(230,231)]
+      PSI: KtConstantExpression at (10,38-39)