diff --git a/compiler/src/dotty/tools/dotc/config/Properties.scala b/compiler/src/dotty/tools/dotc/config/Properties.scala
index 3ec49d8eef68..ca5d94977690 100644
--- a/compiler/src/dotty/tools/dotc/config/Properties.scala
+++ b/compiler/src/dotty/tools/dotc/config/Properties.scala
@@ -84,11 +84,11 @@ trait PropertiesTrait {
 
   /** Whether the current version of compiler is experimental
    *
-   *  1. Snapshot and nightly releases are experimental.
+   *  1. Snapshot, nightly releases and non-bootstrapped compiler are experimental.
    *  2. Features supported by experimental versions of the compiler:
    *     - research plugins
    */
-  val experimental: Boolean = versionString.contains("SNAPSHOT") || versionString.contains("NIGHTLY")
+  val experimental: Boolean = versionString.contains("SNAPSHOT") || versionString.contains("NIGHTLY") || versionString.contains("nonbootstrapped")
 
   val copyrightString: String       = scalaPropOrElse("copyright.string", "(c) 2002-2017 LAMP/EPFL")
 
diff --git a/compiler/src/dotty/tools/dotc/typer/Inliner.scala b/compiler/src/dotty/tools/dotc/typer/Inliner.scala
index b611c25ca40e..973df2e5756c 100644
--- a/compiler/src/dotty/tools/dotc/typer/Inliner.scala
+++ b/compiler/src/dotty/tools/dotc/typer/Inliner.scala
@@ -94,7 +94,8 @@ object Inliner {
       if (tree.symbol == defn.CompiletimeTesting_typeChecks) return Intrinsics.typeChecks(tree)
       if (tree.symbol == defn.CompiletimeTesting_typeCheckErrors) return Intrinsics.typeCheckErrors(tree)
 
-    Feature.checkExperimentalDef(tree.symbol, tree)
+    if tree.symbol.isExperimental then
+      Feature.checkExperimentalDef(tree.symbol, tree)
 
     /** Set the position of all trees logically contained in the expansion of
      *  inlined call `call` to the position of `call`. This transform is necessary