Fix workspace tests

Cargo.toml

@@ -22,16 +22,15 @@ include = [
     "tests/**/*.rs", # debian packaging wants this
 ]
 
+[workspace]
+members = ["impl"]
 
 [dependencies]
 derive_more-impl = { version = "=0.99.17", path = "impl" }
 
 [build-dependencies]
 rustc_version = { version = "0.4", optional = true }
 
-[workspace]
-members = ["impl"]
-
 [dev-dependencies]
 rustversion = "1.0"
 trybuild = "1.0.56"
@@ -64,7 +63,6 @@ mul = ["derive_more-impl/mul"]
 not = ["derive_more-impl/not"]
 sum = ["derive_more-impl/sum"]
 try_into = ["derive_more-impl/try_into"]
-testing-helpers = ["rustc_version"]
 is_variant = ["derive_more-impl/is_variant"]
 unwrap = ["derive_more-impl/unwrap"]
 
@@ -94,6 +92,8 @@ default = [
     "unwrap"
 ]
 
+testing-helpers = ["derive_more-impl/testing-helpers", "rustc_version"]
+
 [[test]]
 name = "add_assign"
 path = "tests/add_assign.rs"

impl/Cargo.toml

@@ -1,9 +1,9 @@
 [package]
 name = "derive_more-impl"
-version = "0.99.17"
+version = "0.99.17" # should be the same as main crate version
 edition = "2021"
 rust-version = "1.56.0"
-description = "Adds #[derive(x)] macros for more traits"
+description = "Internal implementation of `derive_more` crate"
 authors = ["Jelte Fennema <github-tech@jeltef.nl>"]
 license = "MIT"
 repository = "https://github.com/JelteF/derive_more"
@@ -32,8 +32,7 @@ unicode-xid = { version = "0.2.2", optional = true }
 rustc_version = { version = "0.4", optional = true }
 
 [dev-dependencies]
-rustversion = "1.0"
-trybuild = "1.0.56"
+derive_more = { path = ".." }
 
 [badges]
 github = { repository = "JelteF/derive_more", workflow = "CI" }
@@ -63,8 +62,9 @@ mul = ["syn/extra-traits"]
 not = ["syn/extra-traits"]
 sum = []
 try_into = ["syn/extra-traits"]
-testing-helpers = ["rustc_version"]
 is_variant = ["convert_case"]
-unwrap = ["convert_case", "rustc_version"]
+unwrap = ["convert_case"]
 
 default = []
+
+testing-helpers = ["rustc_version"]

impl/build.rs

@@ -0,0 +1,15 @@
+#[cfg(not(feature = "testing-helpers"))]
+fn detect_nightly() {}
+
+#[cfg(feature = "testing-helpers")]
+fn detect_nightly() {
+    use rustc_version::{version_meta, Channel};
+
+    if version_meta().unwrap().channel == Channel::Nightly {
+        println!("cargo:rustc-cfg=nightly");
+    }
+}
+
+fn main() {
+    detect_nightly();
+}

impl/doc/error.md

@@ -47,11 +47,11 @@ ignored for one of these methods by using `#[error(not(backtrace))]` or
 ## Example usage
 
 ```rust
-# #![cfg_attr(feature = "nightly", feature(error_generic_member_access, provide_any))]
+# #![cfg_attr(nightly, feature(error_generic_member_access, provide_any))]
 // Nightly requires enabling this features:
 // #![feature(error_generic_member_access, provide_any)]
-# #[cfg(not(feature = "nightly"))] fn main() {}
-# #[cfg(feature = "nightly")] fn main() {
+# #[cfg(not(nightly))] fn main() {}
+# #[cfg(nightly)] fn main() {
 # use std::{any, error::Error as _, backtrace::Backtrace};
 #
 # use derive_more::{Display, Error, From};