Added local label reference (not final yet), but referencing kind of works.

src/test/java/de/platon42/intellij/plugins/m68k/refs/M68kReferenceContributorTest.kt

@@ -0,0 +1,37 @@
+package de.platon42.intellij.plugins.m68k.refs
+
+import com.intellij.psi.PsiElement
+import com.intellij.testFramework.fixtures.CodeInsightTestFixture
+import de.platon42.intellij.jupiter.LightCodeInsightExtension
+import de.platon42.intellij.jupiter.MyFixture
+import de.platon42.intellij.jupiter.TestDataPath
+import de.platon42.intellij.jupiter.TestDataSubPath
+import de.platon42.intellij.plugins.m68k.AbstractM68kTest
+import de.platon42.intellij.plugins.m68k.psi.M68kLocalLabel
+import org.assertj.core.api.Assertions.assertThat
+import org.junit.jupiter.api.Test
+import org.junit.jupiter.api.extension.ExtendWith
+
+@TestDataPath("src/test/resources/references")
+@TestDataSubPath("labels")
+@ExtendWith(LightCodeInsightExtension::class)
+internal class M68kReferenceContributorTest : AbstractM68kTest() {
+
+    @Test
+    internal fun reference_to_dot_local_label(@MyFixture myFixture: CodeInsightTestFixture) {
+//        val reference = myFixture.getReferenceAtCaretPositionWithAssertion("dot_local_label.asm")
+//        assertThat(reference.element).isInstanceOf(M68kSym)
+        myFixture.configureByFile("dot_local_label.asm")
+        assertThat(myFixture.elementAtCaret).isInstanceOf(M68kLocalLabel::class.java)
+            .extracting(PsiElement::getText).isEqualTo(".loop")
+    }
+
+    @Test
+    internal fun reference_to_multiple_conditional_local_label_dollar(@MyFixture myFixture: CodeInsightTestFixture) {
+        val reference = myFixture.getReferenceAtCaretPositionWithAssertion("multiple_conditional_local_label_dollar.asm")
+        assertThat(reference.element).isInstanceOf(M68kLocalLabel::class.java)
+        myFixture.configureByFile("multiple_conditional_local_label_dollar.asm")
+        assertThat(myFixture.elementAtCaret).isInstanceOf(M68kLocalLabel::class.java)
+            .extracting(PsiElement::getText).isEqualTo("loop$")
+    }
+}

src/test/resources/references/labels/dot_local_label.asm

@@ -0,0 +1,10 @@
+
+main
+        tst.w   d1
+        beq.s   .skip
+        moveq.l #42,d0
+.loop   move.l  d0,(a0)+
+        dbra    d0,.l<caret>oop
+.skip   subq.w  #1,d1
+        beq.s   .loop
+        rts

src/test/resources/references/labels/multiple_conditional_local_label_dollar.asm

@@ -0,0 +1,14 @@
+
+main
+        tst.w   d1
+        beq.s   .skip
+        moveq.l #42,d0
+        IFEQ    DATAWIDTH=4
+loop$   move.l  d0,(a0)+
+        ELSE
+loop$   move.w  d0,(a0)+
+        ENDC
+        dbra    d0,l<caret>oop$
+.skip   subq.w  #1,d1
+        beq.s   loop$
+        rts