Merge #35

35: Add `num_traits` proc_macro helper for explicit import r=cuviper a=jean-airoldie

This allows the user to specify a identifier for the `num_traits` crate
so that the proc_macros can directly depend in it.

This is usefull when reexporting `num-derive` and using `num-trait` as
a transitive import.

Fixes #34.

CC. @vglavnyy

Co-authored-by: jean-airoldie <25088801+jean-airoldie@users.noreply.github.com>
Co-authored-by: Josh Stone <cuviper@gmail.com>

Author: 3 people

.github/workflows/ci.yaml

@@ -49,7 +49,7 @@ jobs:
           command: build
           # This test crate is intentionally separate, because we need
           # independent features for no-std. (rust-lang/cargo#2589)
-          args: --target thumbv6m-none-eabi --manifest-path check/Cargo.toml
+          args: --target thumbv6m-none-eabi --manifest-path ci/check/Cargo.toml
 
   fmt:
     name: Format

Cargo.toml

@@ -19,7 +19,7 @@ quote = "1"
 syn = "1"
 
 [dev-dependencies]
-num = "0.2"
+num = "0.3"
 num-traits = "0.2"
 
 [features]

check/Cargo.toml renamed to ci/check/Cargo.toml

@@ -5,7 +5,7 @@ authors = ["Josh Stone <cuviper@gmail.com>"]
 edition = "2018"
 
 [dependencies.num-derive]
-path = ".."
+path = "../.."
 
 [dependencies.num-traits]
 version = "0.2"

check/src/lib.rs renamed to ci/check/src/lib.rs

@@ -0,0 +1,10 @@
+[package]
+name = "import"
+version = "0.0.1"
+authors = ["jean-airoldie <25088801+jean-airoldie@users.noreply.github.com>"]
+edition = "2018"
+publish = false
+
+[dependencies]
+num-derive = { path = "../.." }
+num = { version = "0.3", default-features = false }

ci/import/Cargo.toml

@@ -0,0 +1,19 @@
+#[macro_use]
+extern crate num_derive;
+
+#[derive(
+    Debug,
+    Clone,
+    Copy,
+    PartialEq,
+    PartialOrd,
+    ToPrimitive,
+    FromPrimitive,
+)]
+#[num_traits = "num"]
+#[repr(u8)]
+enum Rgb {
+    Red = 0,
+    Green = 1,
+    Black = 2,
+}

ci/import/src/lib.rs

@@ -45,3 +45,7 @@ done
 # test all supported features
 cargo build --features="${FEATURES[*]}"
 cargo test --features="${FEATURES[*]}"
+
+# these CI crates keep tighter control over dependencies
+cargo check --verbose --manifest-path ci/check/Cargo.toml
+cargo check --verbose --manifest-path ci/import/Cargo.toml