[FIR] Add test data

compiler/testData/diagnostics/tests/properties/backingField/trivialExplicitBackingFIeld.fir.kt

@@ -0,0 +1,4 @@
+class A {
+    val number: Number
+        field = 1
+}

compiler/testData/diagnostics/tests/properties/backingField/trivialExplicitBackingFIeld.kt

@@ -0,0 +1,4 @@
+class A {
+    <!MUST_BE_INITIALIZED_OR_BE_ABSTRACT!>val number: Number<!>
+        <!EXPLICIT_BACKING_FIELDS_UNSUPPORTED!>field = 1<!>
+}

compiler/testData/diagnostics/tests/properties/backingField/trivialExplicitBackingFIeld.txt

@@ -0,0 +1,9 @@
+package
+
+public final class A {
+    public constructor A()
+    public final val number: kotlin.Number
+    public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+    public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+    public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+}

compiler/testData/psi/propertyBackingField/explicitBackingField.txt

@@ -197,17 +197,22 @@ KtFile: explicitBackingField.kt
     PsiWhiteSpace('\n    ')
     BACKING_FIELD
       PsiElement(field)('field')
-      PsiWhiteSpace(' ')
-      BLOCK
-        PsiElement(LBRACE)('{')
-        PsiWhiteSpace('\n        ')
-        RETURN
-          PsiElement(return)('return')
-          PsiWhiteSpace(' ')
-          INTEGER_CONSTANT
-            PsiElement(INTEGER_LITERAL)('10')
-        PsiWhiteSpace('\n    ')
-        PsiElement(RBRACE)('}')
+    PsiErrorElement:Property getter or setter expected
+      <empty list>
+  PsiWhiteSpace(' ')
+  FUN
+    PsiErrorElement:Expecting a top level declaration
+      <empty list>
+    BLOCK
+      PsiElement(LBRACE)('{')
+      PsiWhiteSpace('\n        ')
+      RETURN
+        PsiElement(return)('return')
+        PsiWhiteSpace(' ')
+        INTEGER_CONSTANT
+          PsiElement(INTEGER_LITERAL)('10')
+      PsiWhiteSpace('\n    ')
+      PsiElement(RBRACE)('}')
   PsiWhiteSpace('\n\n')
   PROPERTY
     PsiElement(val)('val')