Fix extern static warning

See rust-lang/rust#35112

src/coercions/bool.rs

@@ -15,7 +15,7 @@ impl UncheckedValue<bool> for VALUE {
 
 impl ToRust<bool> for CheckedValue<bool> {
     fn to_rust(self) -> bool {
-        if self.inner == Qtrue {
+        if self.inner == unsafe { Qtrue } {
             true
         } else {
             false
@@ -26,9 +26,9 @@ impl ToRust<bool> for CheckedValue<bool> {
 impl ToRuby for bool {
     fn to_ruby(self) -> VALUE {
         if self {
-            Qtrue
+            unsafe { Qtrue }
         } else {
-            Qfalse
+            unsafe { Qfalse }
         }
     }
-}
+}

src/coercions/unit.rs

@@ -3,6 +3,6 @@ use ToRuby;
 
 impl ToRuby for () {
     fn to_ruby(self) -> VALUE {
-        sys::Qnil
+        unsafe { sys::Qnil }
     }
-}
+}

src/lib.rs

@@ -75,7 +75,7 @@ impl RubyMethod for extern "C" fn(VALUE, VALUE) -> VALUE {
 #[allow(non_snake_case)]
 #[inline]
 fn ObjectClass() -> Class {
-    Class(sys::rb_cObject)
+    Class(unsafe { sys::rb_cObject })
 }
 
 impl Class {

src/macros.rs

@@ -67,7 +67,7 @@ macro_rules! class_definition {
                     let checked = __checked_call__(rb_self, $($arg),*);
                     match checked {
                         Ok(val) => $crate::ToRuby::to_ruby(val),
-                        Err(err) => { println!("TYPE ERROR: {:?}", err); $crate::sys::Qnil }
+                        Err(err) => { println!("TYPE ERROR: {:?}", err); unsafe { $crate::sys::Qnil } }
                     }
                 }
 
@@ -137,7 +137,7 @@ macro_rules! reopen_class_definition {
                     let checked = __checked_call__(rb_self, $($arg),*);
                     match checked {
                         Ok(val) => $crate::ToRuby::to_ruby(val),
-                        Err(err) => { println!("TYPE ERROR: {:?}", err); $crate::sys::Qnil }
+                        Err(err) => { println!("TYPE ERROR: {:?}", err); unsafe { $crate::sys::Qnil } }
                     }
                 }