Fix rust 2018 dyn warnings

Author: kyren

.gitignore

@@ -3,3 +3,5 @@ target/
 Cargo.lock
 .DS_Store
 .#*
+.envrc
+shell.nix

src/lua.rs

@@ -383,7 +383,7 @@ pub(crate) struct ExtraData {
     used_memory: usize,
     memory_limit: Option<usize>,
 
-    pub hook_callback: Option<Rc<RefCell<FnMut(Context, Debug) -> Result<()>>>>,
+    pub hook_callback: Option<Rc<RefCell<dyn FnMut(Context, Debug) -> Result<()>>>>,
 }
 
 pub(crate) unsafe fn extra_data(state: *mut ffi::lua_State) -> *mut ExtraData {

src/scope.rs

@@ -26,7 +26,7 @@ use crate::value::{FromLuaMulti, MultiValue, ToLuaMulti, Value};
 /// [`Context::scope`]: struct.Context.html#method.scope
 pub struct Scope<'lua, 'scope> {
     lua: Context<'lua>,
-    destructors: RefCell<Vec<(LuaRef<'lua>, fn(LuaRef<'lua>) -> Box<Any>)>>,
+    destructors: RefCell<Vec<(LuaRef<'lua>, fn(LuaRef<'lua>) -> Box<dyn Any>)>>,
     _scope_invariant: Invariant<'scope>,
 }
 
@@ -330,10 +330,10 @@ impl<'lua, 'scope> Drop for Scope<'lua, 'scope> {
 }
 
 enum NonStaticMethod<'lua, T> {
-    Method(Box<Fn(Context<'lua>, &T, MultiValue<'lua>) -> Result<MultiValue<'lua>>>),
-    MethodMut(Box<FnMut(Context<'lua>, &mut T, MultiValue<'lua>) -> Result<MultiValue<'lua>>>),
-    Function(Box<Fn(Context<'lua>, MultiValue<'lua>) -> Result<MultiValue<'lua>>>),
-    FunctionMut(Box<FnMut(Context<'lua>, MultiValue<'lua>) -> Result<MultiValue<'lua>>>),
+    Method(Box<dyn Fn(Context<'lua>, &T, MultiValue<'lua>) -> Result<MultiValue<'lua>>>),
+    MethodMut(Box<dyn FnMut(Context<'lua>, &mut T, MultiValue<'lua>) -> Result<MultiValue<'lua>>>),
+    Function(Box<dyn Fn(Context<'lua>, MultiValue<'lua>) -> Result<MultiValue<'lua>>>),
+    FunctionMut(Box<dyn FnMut(Context<'lua>, MultiValue<'lua>) -> Result<MultiValue<'lua>>>),
 }
 
 struct NonStaticUserDataMethods<'lua, T: UserData> {

src/types.rs

@@ -17,7 +17,7 @@ pub type Number = ffi::lua_Number;
 pub struct LightUserData(pub *mut c_void);
 
 pub(crate) type Callback<'lua, 'a> =
-    Box<Fn(Context<'lua>, MultiValue<'lua>) -> Result<MultiValue<'lua>> + 'a>;
+    Box<dyn Fn(Context<'lua>, MultiValue<'lua>) -> Result<MultiValue<'lua>> + 'a>;
 
 /// An auto generated key into the Lua registry.
 ///

src/util.rs

@@ -688,7 +688,7 @@ pub unsafe fn init_error_registry(state: *mut ffi::lua_State) {
 }
 
 struct WrappedError(pub Error);
-struct WrappedPanic(pub Option<Box<Any + Send>>);
+struct WrappedPanic(pub Option<Box<dyn Any + Send>>);
 
 // Converts the given lua value to a string in a reasonable format without causing a Lua error or
 // panicking.

tests/tests.rs

@@ -165,7 +165,7 @@ fn test_error() {
             "test error"
         }
 
-        fn cause(&self) -> Option<&error::Error> {
+        fn cause(&self) -> Option<&dyn error::Error> {
             None
         }
     }