Add a step to the CI to make sure the crate builds properly on #![no_…

…std] platforms.

.github/workflows/test.yml

@@ -23,3 +23,16 @@ jobs:
       with:
         command: test
         args: ${{ matrix.args }}
+  build_no_std:
+    steps:
+    - uses: actions/checkout@v1
+    - uses: actions-rs/toolchain@v1
+      with:
+        profile: minimal
+        toolchain: nightly
+        target: thumbv6m-none-eabi
+        default: true
+    - uses: actions-rs/cargo@v1
+      with:
+        command: build
+        args: --target thumbv6m-none-eabi -p enumset_test_no_std

Cargo.toml

@@ -2,6 +2,7 @@
 members = [
     "enumset",
     "enumset_derive",
+    "enumset_test_no_std",
 ]
 
 [profile.release]

enumset_test_no_std/Cargo.toml

@@ -0,0 +1,9 @@
+[package]
+name = "enumset_test_no_std"
+version = "0.0.0"
+edition = "2021"
+
+description = "DO NOT PUBLISH"
+
+[dependencies]
+enumset = { path = "../enumset" }

enumset_test_no_std/src/main.rs

@@ -0,0 +1,26 @@
+#![no_std]
+#![feature(start)]
+
+use core::panic::PanicInfo;
+use enumset::*;
+
+#[derive(EnumSetType)]
+pub enum SmallEnum {
+    A,
+    B,
+    C,
+}
+
+#[start]
+fn main(_: isize, _: *const *const u8) -> isize {
+    let e = SmallEnum::A | SmallEnum::B;
+    if e.contains(SmallEnum::C) {
+        panic!("oh no!");
+    }
+    0
+}
+
+#[panic_handler]
+fn panic(_info: &PanicInfo) -> ! {
+    loop {}
+}