diff --git a/.travis.yml b/.travis.yml
index 7796110e..f29188a7 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -118,4 +118,4 @@ script:
 
 
   - cd "${TRAVIS_BUILD_DIR}/testing/version_compatibility/user_0"
-  - cargo run --features run
+  - cargo run
diff --git a/testing/version_compatibility/impl_0/Cargo.toml b/testing/version_compatibility/impl_0/Cargo.toml
index 44cd3a90..51e80e35 100644
--- a/testing/version_compatibility/impl_0/Cargo.toml
+++ b/testing/version_compatibility/impl_0/Cargo.toml
@@ -5,8 +5,8 @@ authors = ["rodrimati1992 <rodrimatt1985@gmail.com>"]
 edition = "2018"
 
 [dependencies]
-abi_stable={path="../../../abi_stable",package="abi_stable"}
-# abi_stable={version="*"}
+# abi_stable={path="../../../abi_stable",package="abi_stable"}
+abi_stable={version="*"}
 
 [dependencies.version_compatibility_interface]
 version="0.1"
diff --git a/testing/version_compatibility/interface/Cargo.toml b/testing/version_compatibility/interface/Cargo.toml
index 97dbefb8..7a7a2c17 100644
--- a/testing/version_compatibility/interface/Cargo.toml
+++ b/testing/version_compatibility/interface/Cargo.toml
@@ -11,5 +11,5 @@ old=[]
 new=[]
 
 [dependencies]
-# old_abi_stable={version="*",package="abi_stable"}
+old_abi_stable={version="*",package="abi_stable"}
 new_abi_stable={path="../../../abi_stable",package="abi_stable"}
diff --git a/testing/version_compatibility/interface/src/lib.rs b/testing/version_compatibility/interface/src/lib.rs
index cce0b52b..c6d7a189 100644
--- a/testing/version_compatibility/interface/src/lib.rs
+++ b/testing/version_compatibility/interface/src/lib.rs
@@ -1,12 +1,12 @@
 
-// #[cfg(feature="new")]
+#[cfg(feature="new")]
 extern crate new_abi_stable as abi_stable;
 
-// #[cfg(not(feature="new"))]
-// extern crate old_abi_stable as abi_stable;
+#[cfg(not(feature="new"))]
+extern crate old_abi_stable as abi_stable;
 
-// #[cfg(all(feature="new",feature="old"))]
-// compile_error!{"the new and old feature can't be enabled at the same time"}
+#[cfg(all(feature="new",feature="old"))]
+compile_error!{"the new and old feature can't be enabled at the same time"}
 
 
 use abi_stable::{
diff --git a/testing/version_compatibility/user_0/Cargo.toml b/testing/version_compatibility/user_0/Cargo.toml
index 40cab46c..775079a5 100644
--- a/testing/version_compatibility/user_0/Cargo.toml
+++ b/testing/version_compatibility/user_0/Cargo.toml
@@ -4,18 +4,11 @@ version = "0.1.0"
 authors = ["rodrimati1992 <rodrimatt1985@gmail.com>"]
 edition = "2018"
 
-[features]
-"run" = [
-    "version_compatibility_interface/new",
-    "version_compatibility_interface/old",
-]
-
 [dependencies]
 abi_stable={path="../../../abi_stable"}
 core_extensions={ version = "0.1.18", default_features = false }
 
-
-
 [dependencies.version_compatibility_interface]
 version="0.1"
 path="../interface"
+features = ["new"]
\ No newline at end of file
diff --git a/testing/version_compatibility/user_0/src/main.rs b/testing/version_compatibility/user_0/src/main.rs
index 8511d36d..55506fdb 100644
--- a/testing/version_compatibility/user_0/src/main.rs
+++ b/testing/version_compatibility/user_0/src/main.rs
@@ -37,32 +37,35 @@ fn compute_library_dir()->io::Result<PathBuf>{
 
 
 fn main()-> io::Result<()> {
-    if cfg!(not(feature = "run")) {
-        panic!(r#"Please compile this with --feature run "#);
-    }
-
     let library_dir=compute_library_dir().unwrap();
 
     (||->Result<(),LibraryError>{
         let header=abi_header_from_path(&RootMod_Ref::get_library_path(&library_dir))?;
 
+        println!("header: {:?}", header);
+        println!();
         println!("Executable's AbiHeader {:?}", AbiHeader::VALUE);
+        println!();
         println!("Executable's abi_stable version {:?}", abi_stable::ABI_STABLE_VERSION);
-
         println!();
 
         if header.is_valid() {
             let lib_header=header.upgrade()?;
-            
-            println!("Loaded AbiHeader {:?}", header);
 
             unsafe{
                 let root=lib_header.init_root_module_with_unchecked_layout::<RootMod_Ref>()?;
                 println!("Loaded abi_stable version {:?}", root.abi_stable_version());
+                println!();
             }
 
 
             lib_header.check_layout::<RootMod_Ref>()?;
+            println!("\
+                The types in abi_stable on crates.io are compatible with those on \
+                the \"local\" repository\
+            ");
+        } else {
+            println!("The abi_stable on crates.io isn't semver compatible with this one");
         }
         Ok(())
     })().unwrap_or_else(|e| panic!("{}", e) );