From 1a60429dd7ca77b13bcf40aa67d42cedd5951656 Mon Sep 17 00:00:00 2001
From: Toshiaki Kameyama <kmymtsak@gmail.com>
Date: Tue, 30 Aug 2022 00:40:14 +0900
Subject: [PATCH] UnusedPrivateMember: fix false positive with backtick
 parameters (#5252)

---
 .../detekt/rules/style/UnusedPrivateMember.kt         |  2 +-
 .../detekt/rules/style/UnusedPrivateMemberSpec.kt     | 11 +++++++++++
 2 files changed, 12 insertions(+), 1 deletion(-)

diff --git a/detekt-rules-style/src/main/kotlin/io/gitlab/arturbosch/detekt/rules/style/UnusedPrivateMember.kt b/detekt-rules-style/src/main/kotlin/io/gitlab/arturbosch/detekt/rules/style/UnusedPrivateMember.kt
index 9180de718ad..eaf21701784 100644
--- a/detekt-rules-style/src/main/kotlin/io/gitlab/arturbosch/detekt/rules/style/UnusedPrivateMember.kt
+++ b/detekt-rules-style/src/main/kotlin/io/gitlab/arturbosch/detekt/rules/style/UnusedPrivateMember.kt
@@ -258,7 +258,7 @@ private class UnusedParameterVisitor(allowedNames: Regex) : UnusedMemberVisitor(
             }
 
             override fun visitReferenceExpression(expression: KtReferenceExpression) {
-                parameters.remove(expression.text)
+                parameters.remove(expression.text.removeSurrounding("`"))
                 super.visitReferenceExpression(expression)
             }
         })
diff --git a/detekt-rules-style/src/test/kotlin/io/gitlab/arturbosch/detekt/rules/style/UnusedPrivateMemberSpec.kt b/detekt-rules-style/src/test/kotlin/io/gitlab/arturbosch/detekt/rules/style/UnusedPrivateMemberSpec.kt
index f7e39e0cb5d..145541479fb 100644
--- a/detekt-rules-style/src/test/kotlin/io/gitlab/arturbosch/detekt/rules/style/UnusedPrivateMemberSpec.kt
+++ b/detekt-rules-style/src/test/kotlin/io/gitlab/arturbosch/detekt/rules/style/UnusedPrivateMemberSpec.kt
@@ -1468,6 +1468,17 @@ class UnusedPrivateMemberSpec(val env: KotlinCoreEnvironment) {
         }
     }
 
+    @Nested
+    inner class `backtick identifiers - #5251` {
+        @Test
+        fun `does not report used backtick parameters`() {
+            val code = """
+                fun test(`foo bar`: Int) = `foo bar`
+            """
+            assertThat(subject.compileAndLintWithContext(env, code)).isEmpty()
+        }
+    }
+
     @Nested
     inner class `list get overloaded operator function - #3640` {
         @Test