FIR (raw / resolution API): set correctly elvis/bang-bang bound PSIs

compiler/fir/psi2fir/src/org/jetbrains/kotlin/fir/builder/ConversionUtils.kt

@@ -185,25 +185,25 @@ internal fun FirExpression.generateNotNullOrOther(
     session: FirSession, other: FirExpression, caseId: String, basePsi: KtElement
 ): FirWhenExpression {
     val subjectName = Name.special("<$caseId>")
-    val subjectVariable = generateTemporaryVariable(session, psi, subjectName, this)
+    val subjectVariable = generateTemporaryVariable(session, basePsi, subjectName, this)
     val subject = FirWhenSubject()
-    val subjectExpression = FirWhenSubjectExpressionImpl(psi, subject)
+    val subjectExpression = FirWhenSubjectExpressionImpl(basePsi, subject)
     return FirWhenExpressionImpl(
         basePsi, this, subjectVariable
     ).apply {
         subject.bind(this)
         branches += FirWhenBranchImpl(
-            psi,
-            FirOperatorCallImpl(psi, FirOperation.EQ).apply {
+            basePsi,
+            FirOperatorCallImpl(basePsi, FirOperation.EQ).apply {
                 arguments += subjectExpression
-                arguments += FirConstExpressionImpl(psi, IrConstKind.Null, null)
+                arguments += FirConstExpressionImpl(basePsi, IrConstKind.Null, null)
             },
             FirSingleExpressionBlock(other)
         )
         branches += FirWhenBranchImpl(
-            other.psi, FirElseIfTrueCondition(psi),
+            other.psi, FirElseIfTrueCondition(basePsi),
             FirSingleExpressionBlock(
-                FirUncheckedNotNullCastImpl(psi, generateResolvedAccessExpression(psi, subjectVariable))
+                FirUncheckedNotNullCastImpl(basePsi, generateResolvedAccessExpression(basePsi, subjectVariable))
             )
         )
     }

idea/testData/fir/lazyResolve/elvis/elvis.test

@@ -0,0 +1,3 @@
+{
+  "mainFile": "main.kt"
+}

idea/testData/fir/lazyResolve/elvis/main.kt

@@ -0,0 +1,7 @@
+package elvis
+
+class WithElvis(val value: String?) {
+    fun foo() = <caret>value ?: ""
+}
+
+

idea/testData/fir/lazyResolve/elvis/main.txt

@@ -0,0 +1,22 @@
+FILE: main.kt
+    public final class WithElvis : R|kotlin/Any| {
+        public constructor(value: R|kotlin/String?|): R|elvis/WithElvis| {
+            super<R|kotlin/Any|>()
+        }
+
+        public final val value: R|kotlin/String?| = R|<local>/value|
+            public get(): R|kotlin/String?|
+
+        public final fun foo(): R|kotlin/String| {
+            ^foo when (lval <elvis>: R|kotlin/String?| = R|elvis/WithElvis.value|) {
+                ==($subj$, Null(null)) ->  {
+                    String()
+                }
+                else ->  {
+                    R|<local>/<elvis>|!
+                }
+            }
+
+        }
+
+    }

idea/testData/fir/lazyResolve/elvis/results.txt

@@ -0,0 +1 @@
+R|elvis/WithElvis.value|

idea/tests/org/jetbrains/kotlin/idea/fir/FirLazyResolveTestGenerated.java

@@ -29,6 +29,11 @@ public class FirLazyResolveTestGenerated extends AbstractFirLazyResolveTest {
         KotlinTestUtils.assertAllTestsPresentInSingleGeneratedClass(this.getClass(), new File("idea/testData/fir/lazyResolve"), Pattern.compile("^(.+)\\.test$"), TargetBackend.ANY);
     }
 
+    @TestMetadata("elvis/elvis.test")
+    public void testElvis_Elvis() throws Exception {
+        runTest("idea/testData/fir/lazyResolve/elvis/elvis.test");
+    }
+
     @TestMetadata("inInit/inInit.test")
     public void testInInit_InInit() throws Exception {
         runTest("idea/testData/fir/lazyResolve/inInit/inInit.test");