Re-export traits (#273)

Re-export traits from `std` for all our derives. This way people don't
need to import traits manually when they want to reference them
somewhere, such as bounds.

Fixes #271

---------

Co-authored-by: tyranron <tyranron@gmail.com>

CHANGELOG.md

@@ -35,6 +35,7 @@ and this project adheres to [Semantic Versioning](http://semver.org/).
   and ignores field type itself.
 - The `Into` derive now uses `#[into(<types>)]` instead of `#[into(types(<types>))]`
   and ignores field type itself.
+- Importing a derive macro now also import its corresponding trait.
 
 ### Added
 

Cargo.toml

@@ -61,7 +61,6 @@ index = ["derive_more-impl/index"]
 index_mut = ["derive_more-impl/index_mut"]
 into = ["derive_more-impl/into"]
 into_iterator = ["derive_more-impl/into_iterator"]
-iterator = ["derive_more-impl/iterator"]
 mul_assign = ["derive_more-impl/mul_assign"]
 mul = ["derive_more-impl/mul"]
 not = ["derive_more-impl/not"]
@@ -73,8 +72,8 @@ try_unwrap = ["derive_more-impl/try_unwrap"]
 
 std = []
 full = [
-    "add_assign",
     "add",
+    "add_assign",
     "as_mut",
     "as_ref",
     "constructor",
@@ -90,14 +89,13 @@ full = [
     "into",
     "into_iterator",
     "is_variant",
-    "iterator",
-    "mul_assign",
     "mul",
+    "mul_assign",
     "not",
     "sum",
     "try_into",
-    "unwrap",
     "try_unwrap",
+    "unwrap",
 ]
 
 testing-helpers = ["derive_more-impl/testing-helpers", "dep:rustc_version"]

README.md

@@ -176,6 +176,15 @@ extern crate derive_more;
 # fn main() {} // omit wrapping statements above into `main()` in tests
 ```
 
+## Re-exports
+
+This crate also re-exports all of the standard library traits that it adds
+derives for. So both the `Display` derive and the `Display` trait will be in
+scope when you add the following code:
+```rust
+use derive_more::Display;
+```
+
 [`cargo-expand`]: https://github.com/dtolnay/cargo-expand
 [`derive-new`]: https://github.com/nrc/derive-new
 

impl/Cargo.toml

@@ -33,7 +33,7 @@ unicode-xid = { version = "0.2.2", optional = true }
 rustc_version = { version = "0.4", optional = true }
 
 [dev-dependencies]
-derive_more = { path = "..", features = ["add", "debug", "error", "from_str", "not", "std", "try_into", "try_unwrap"] }
+derive_more = { path = "..", features = ["full"] }
 itertools = "0.11.0"
 
 [badges]
@@ -45,8 +45,8 @@ rustdoc-args = ["--cfg", "docsrs"]
 [features]
 default = []
 
-add_assign = []
 add = []
+add_assign = []
 as_mut = []
 as_ref = []
 constructor = []
@@ -61,14 +61,13 @@ index = []
 index_mut = []
 into = ["syn/extra-traits"]
 into_iterator = []
-iterator = []
-mul_assign = ["syn/extra-traits"]
+is_variant = ["dep:convert_case"]
 mul = ["syn/extra-traits"]
+mul_assign = ["syn/extra-traits"]
 not = ["syn/extra-traits"]
 sum = []
 try_into = ["syn/extra-traits"]
-is_variant = ["dep:convert_case"]
-unwrap = ["dep:convert_case"]
 try_unwrap = ["dep:convert_case"]
+unwrap = ["dep:convert_case"]
 
 testing-helpers = ["dep:rustc_version"]

impl/doc/display.md

@@ -86,8 +86,6 @@ Note how we have to bound `U` and `V` by `Display` in the following example, as
 Not even `Display`.
 
 ```rust
-# use std::fmt::Display;
-#
 # use derive_more::Display;
 #
 # trait MyTrait { fn my_function(&self) -> i32; }

impl/src/add_like.rs

@@ -42,7 +42,7 @@ pub fn expand(input: &DeriveInput, trait_name: &str) -> TokenStream {
 
     quote! {
         #[automatically_derived]
-        impl #impl_generics ::core::ops::#trait_ident for #input_type #ty_generics #where_clause {
+        impl #impl_generics ::derive_more::#trait_ident for #input_type #ty_generics #where_clause {
             type Output = #output_type;
 
             #[inline]

impl/src/as_mut.rs

@@ -10,7 +10,6 @@ pub fn expand(input: &DeriveInput, trait_name: &'static str) -> Result<TokenStre
     let state = State::with_type_bound(
         input,
         trait_name,
-        quote! { ::core::convert },
         "as_mut".into(),
         AttrParams::ignore_and_forward(),
         false,

impl/src/as_ref.rs

@@ -10,7 +10,6 @@ pub fn expand(input: &DeriveInput, trait_name: &'static str) -> Result<TokenStre
     let state = State::with_type_bound(
         input,
         trait_name,
-        quote! { ::core::convert },
         "as_ref".into(),
         AttrParams::ignore_and_forward(),
         false,

impl/src/deref.rs

@@ -8,7 +8,6 @@ pub fn expand(input: &DeriveInput, trait_name: &'static str) -> Result<TokenStre
     let state = State::with_field_ignore_and_forward(
         input,
         trait_name,
-        quote! { ::core::ops },
         trait_name.to_lowercase(),
     )?;
     let SingleFieldData {

impl/src/deref_mut.rs

@@ -5,12 +5,8 @@ use syn::{parse::Result, DeriveInput};
 
 /// Provides the hook to expand `#[derive(DerefMut)]` into an implementation of `DerefMut`
 pub fn expand(input: &DeriveInput, trait_name: &'static str) -> Result<TokenStream> {
-    let state = State::with_field_ignore_and_forward(
-        input,
-        trait_name,
-        quote! { ::core::ops },
-        "deref_mut".into(),
-    )?;
+    let state =
+        State::with_field_ignore_and_forward(input, trait_name, "deref_mut".into())?;
     let SingleFieldData {
         input_type,
         trait_path,

impl/src/error.rs

@@ -18,7 +18,6 @@ pub fn expand(
     let state = State::with_attr_params(
         input,
         trait_name,
-        quote! { ::derive_more::__private::Error },
         trait_name.to_lowercase(),
         allowed_attr_params(),
     )?;
@@ -39,7 +38,7 @@ pub fn expand(
 
     let source = source.map(|source| {
         quote! {
-            fn source(&self) -> Option<&(dyn ::derive_more::__private::Error + 'static)> {
+            fn source(&self) -> Option<&(dyn ::derive_more::Error + 'static)> {
                 use ::derive_more::__private::AsDynError;
                 #source
             }
@@ -73,7 +72,7 @@ pub fn expand(
             &generics,
             quote! {
                 where
-                    #(#bounds: ::core::fmt::Debug + ::core::fmt::Display + ::derive_more::__private::Error + 'static),*
+                    #(#bounds: ::core::fmt::Debug + ::core::fmt::Display + ::derive_more::Error + 'static),*
             },
         );
     }
@@ -82,7 +81,7 @@ pub fn expand(
 
     let render = quote! {
         #[automatically_derived]
-        impl #impl_generics ::derive_more::__private::Error for #ident #ty_generics #where_clause {
+        impl #impl_generics ::derive_more::Error for #ident #ty_generics #where_clause {
             #source
             #provide
         }
@@ -120,7 +119,6 @@ fn render_enum(
         let state = State::from_variant(
             state.input,
             state.trait_name,
-            state.trait_module.clone(),
             state.trait_attr.clone(),
             allowed_attr_params(),
             variant,
@@ -207,7 +205,7 @@ impl<'input, 'state> ParsedFields<'input, 'state> {
         let source_provider = self.source.map(|source| {
             let source_expr = &self.data.members[source];
             quote! {
-                ::derive_more::__private::Error::provide(&#source_expr, demand);
+                ::derive_more::Error::provide(&#source_expr, demand);
             }
         });
         let backtrace_provider = self
@@ -237,7 +235,7 @@ impl<'input, 'state> ParsedFields<'input, 'state> {
                 let pattern = self.data.matcher(&[source], &[quote! { source }]);
                 Some(quote! {
                     #pattern => {
-                        ::derive_more::__private::Error::provide(source, demand);
+                        ::derive_more::Error::provide(source, demand);
                     }
                 })
             }
@@ -249,7 +247,7 @@ impl<'input, 'state> ParsedFields<'input, 'state> {
                 Some(quote! {
                     #pattern => {
                         demand.provide_ref::<::std::backtrace::Backtrace>(backtrace);
-                        ::derive_more::__private::Error::provide(source, demand);
+                        ::derive_more::Error::provide(source, demand);
                     }
                 })
             }

impl/src/from_str.rs

@@ -6,12 +6,7 @@ use syn::{parse::Result, DeriveInput};
 
 /// Provides the hook to expand `#[derive(FromStr)]` into an implementation of `FromStr`
 pub fn expand(input: &DeriveInput, trait_name: &'static str) -> Result<TokenStream> {
-    let state = State::new(
-        input,
-        trait_name,
-        quote! { ::core::str },
-        trait_name.to_lowercase(),
-    )?;
+    let state = State::new(input, trait_name, trait_name.to_lowercase())?;
 
     if state.derive_type == DeriveType::Enum {
         Ok(enum_from(input, state, trait_name))

impl/src/index.rs

@@ -6,12 +6,8 @@ use syn::{parse::Result, DeriveInput};
 /// Provides the hook to expand `#[derive(Index)]` into an implementation of `Index`
 pub fn expand(input: &DeriveInput, trait_name: &'static str) -> Result<TokenStream> {
     let index_type = format_ident!("__IdxT");
-    let mut state = State::with_field_ignore(
-        input,
-        trait_name,
-        quote! { ::core::ops },
-        trait_name.to_lowercase(),
-    )?;
+    let mut state =
+        State::with_field_ignore(input, trait_name, trait_name.to_lowercase())?;
     state.add_trait_path_type_param(quote! { #index_type });
     let SingleFieldData {
         field,

impl/src/index_mut.rs

@@ -6,12 +6,7 @@ use syn::{parse::Result, DeriveInput};
 /// Provides the hook to expand `#[derive(IndexMut)]` into an implementation of `IndexMut`
 pub fn expand(input: &DeriveInput, trait_name: &'static str) -> Result<TokenStream> {
     let index_type = format_ident!("__IdxT");
-    let mut state = State::with_field_ignore(
-        input,
-        trait_name,
-        quote! { ::core::ops },
-        "index_mut".into(),
-    )?;
+    let mut state = State::with_field_ignore(input, trait_name, "index_mut".into())?;
     state.add_trait_path_type_param(quote! { #index_type });
     let SingleFieldData {
         field,

impl/src/into_iterator.rs

@@ -7,12 +7,8 @@ use syn::{parse::Result, DeriveInput};
 
 /// Provides the hook to expand `#[derive(IntoIterator)]` into an implementation of `IntoIterator`
 pub fn expand(input: &DeriveInput, trait_name: &'static str) -> Result<TokenStream> {
-    let state = State::with_field_ignore_and_refs(
-        input,
-        trait_name,
-        quote! { ::core::iter },
-        "into_iterator".into(),
-    )?;
+    let state =
+        State::with_field_ignore_and_refs(input, trait_name, "into_iterator".into())?;
     let SingleFieldData {
         input_type,
         info,

impl/src/is_variant.rs

@@ -8,7 +8,6 @@ pub fn expand(input: &DeriveInput, trait_name: &'static str) -> Result<TokenStre
     let state = State::with_attr_params(
         input,
         trait_name,
-        quote! {},
         "is_variant".into(),
         AttrParams {
             enum_: vec!["ignore"],