Correct some stability versions

These were found by running tidy on stable versions of rust and finding
features stabilised with the wrong version numbers.

2 files changed, 4 insertions, 4 deletions

diff --git a/src/libstd/ffi/c_str.rs b/src/libstd/ffi/c_str.rs
index 44b62593fa3..f40475a4142 100644
--- a/src/libstd/ffi/c_str.rs
+++ b/src/libstd/ffi/c_str.rs
@@ -419,14 +419,14 @@ impl<'a> From<&'a CStr> for Box<CStr> {
     }
 }
 
-#[stable(feature = "c_string_from_box", since = "1.17.0")]
+#[stable(feature = "c_string_from_box", since = "1.18.0")]
 impl From<Box<CStr>> for CString {
     fn from(s: Box<CStr>) -> CString {
         s.into_c_string()
     }
 }
 
-#[stable(feature = "box_from_c_string", since = "1.17.0")]
+#[stable(feature = "box_from_c_string", since = "1.18.0")]
 impl Into<Box<CStr>> for CString {
     fn into(self) -> Box<CStr> {
         self.into_boxed_c_str()
diff --git a/src/libstd/ffi/os_str.rs b/src/libstd/ffi/os_str.rs
index b90192dd8af..eaf0502a577 100644
--- a/src/libstd/ffi/os_str.rs
+++ b/src/libstd/ffi/os_str.rs
@@ -529,14 +529,14 @@ impl<'a> From<&'a OsStr> for Box<OsStr> {
     }
 }
 
-#[stable(feature = "os_string_from_box", since = "1.17.0")]
+#[stable(feature = "os_string_from_box", since = "1.18.0")]
 impl<'a> From<Box<OsStr>> for OsString {
     fn from(boxed: Box<OsStr>) -> OsString {
         boxed.into_os_string()
     }
 }
 
-#[stable(feature = "box_from_c_string", since = "1.17.0")]
+#[stable(feature = "box_from_os_string", since = "1.18.0")]
 impl Into<Box<OsStr>> for OsString {
     fn into(self) -> Box<OsStr> {
         self.into_boxed_os_str()