Fix #12351: add test

Author: liufengyun

compiler/test/dotty/tools/dotc/BootstrappedOnlyCompilationTests.scala

@@ -118,6 +118,7 @@ class BootstrappedOnlyCompilationTests {
     aggregateTests(
       compileFilesInDir("tests/run-macros", defaultOptions.and("-Xcheck-macros")),
       compileFilesInDir("tests/run-custom-args/Yretain-trees", defaultOptions and "-Yretain-trees"),
+      compileFilesInDir("tests/run-custom-args/Yread-comments", defaultOptions and "-Yread-comments"),
       compileFilesInDir("tests/run-custom-args/run-macros-erased", defaultOptions.and("-language:experimental.erasedDefinitions").and("-Xcheck-macros")),
     )
   }.checkRuns()

tests/run-custom-args/Yread-comments/i12351/GetDocString_1.scala

@@ -0,0 +1,11 @@
+import scala.quoted.*
+
+/** HELLO */
+case class Data(test: Boolean)
+
+inline def getDocString[T]: Option[String] = ${ getDocStringImpl[T] }
+
+private def getDocStringImpl[T : Type](using Quotes): Expr[Option[String]] = {
+    import quotes.reflect.*
+    Expr(TypeRepr.of[T].typeSymbol.docstring)
+}

tests/run-custom-args/Yread-comments/i12351/Test_2.scala

@@ -0,0 +1,4 @@
+@main def Test(): Unit = {
+    println(getDocString[Data])
+    assert(getDocString[Data].nonEmpty)
+}