Minor, drop unused DiagnosedRange#file

compiler/frontend/src/org/jetbrains/kotlin/checkers/CheckerTestUtil.java

@@ -732,7 +732,6 @@ public class CheckerTestUtil {
         private final int start;
         private int end;
         private final List<TextDiagnostic> diagnostics = ContainerUtil.newSmartList();
-        private PsiFile file;
 
         protected DiagnosedRange(int start) {
             this.start = start;
@@ -757,14 +756,5 @@ public class CheckerTestUtil {
         public void addDiagnostic(String diagnostic) {
             diagnostics.add(TextDiagnostic.parseDiagnostic(diagnostic));
         }
-
-        public void setFile(@NotNull PsiFile file) {
-            this.file = file;
-        }
-
-        @NotNull
-        public PsiFile getFile() {
-            return file;
-        }
     }
 }

compiler/tests-common/org/jetbrains/kotlin/checkers/BaseDiagnosticsTest.kt

@@ -150,9 +150,6 @@ abstract class BaseDiagnosticsTest : KotlinMultiFileTestWithJava<TestModule, Tes
                 this.expectedText = textWithMarkers
                 this.clearText = CheckerTestUtil.parseDiagnosedRanges(addExtras(expectedText), diagnosedRanges)
                 this.ktFile = TestCheckerUtil.createCheckAndReturnPsiFile(fileName, clearText, project)
-                for (diagnosedRange in diagnosedRanges) {
-                    diagnosedRange.file = ktFile
-                }
             }
         }
 

compiler/tests/org/jetbrains/kotlin/checkers/CheckerTestUtilTest.java

@@ -153,9 +153,6 @@ public class CheckerTestUtilTest extends KotlinTestWithEnvironment {
 
             List<DiagnosedRange> diagnosedRanges = Lists.newArrayList();
             CheckerTestUtil.parseDiagnosedRanges(expectedText, diagnosedRanges);
-            for (DiagnosedRange diagnosedRange : diagnosedRanges) {
-                diagnosedRange.setFile(psiFile);
-            }
 
             List<Diagnostic> diagnostics = CheckerTestUtil.getDiagnosticsIncludingSyntaxErrors(bindingContext, psiFile, false, null);
             Collections.sort(diagnostics, CheckerTestUtil.DIAGNOSTIC_COMPARATOR);