Make ui tests std-only, write separate no-std tests

.github/workflows/ci.yml

@@ -72,6 +72,11 @@ jobs:
           toolchain: ${{ matrix.rust }}
           override: true
       - uses: Swatinem/rust-cache@v1
+
+      - uses: actions-rs/cargo@v1
+        with:
+          command: update
+          args: -p libc --precise 0.2.160 # Later versions have a newer MSRV
       - uses: actions-rs/cargo@v1
         with:
           command: test

tests/compile_tests.rs

@@ -3,27 +3,10 @@
 #[test]
 fn no_std() {
     let t = trybuild::TestCases::new();
-    #[cfg(not(feature = "std"))]
-    t.compile_fail("tests/no_std/without.rs");
-    #[cfg(not(feature = "std"))]
-    t.compile_fail("tests/no_std/multi_line.rs");
-    #[cfg(not(feature = "std"))]
-    t.pass("tests/no_std/multi_line_allow.rs");
-    #[cfg(not(feature = "std"))]
-    t.compile_fail("tests/no_std/enum_prefix_missing.rs");
-    #[cfg(not(feature = "std"))]
-    t.pass("tests/no_std/enum_prefix.rs");
-    #[cfg(feature = "std")]
-    t.compile_fail("tests/std/without.rs");
-    #[cfg(feature = "std")]
-    t.compile_fail("tests/std/multi_line.rs");
-    #[cfg(feature = "std")]
-    t.pass("tests/std/multi_line_allow.rs");
-    #[cfg(feature = "std")]
-    t.compile_fail("tests/std/enum_prefix_missing.rs");
-    #[cfg(feature = "std")]
-    t.pass("tests/std/enum_prefix.rs");
-    #[cfg(feature = "std")]
-    t.pass("tests/std/multiple.rs");
-    t.pass("tests/no_std/with.rs");
+    t.compile_fail("tests/ui/without.rs");
+    t.compile_fail("tests/ui/multi_line.rs");
+    t.pass("tests/ui/multi_line_allow.rs");
+    t.compile_fail("tests/ui/enum_prefix_missing.rs");
+    t.pass("tests/ui/enum_prefix.rs");
+    t.pass("tests/ui/multiple.rs");
 }

tests/no_std.rs

@@ -0,0 +1,44 @@
+#![no_std]
+#![allow(unused)]
+
+// This test ensures that the generated code doesn't reference any stdlib items.
+
+use displaydoc::Display;
+
+#[derive(Display)]
+/// Just a basic struct {thing}
+struct HappyStruct {
+    thing: &'static str,
+}
+
+#[derive(Display)]
+#[ignore_extra_doc_attributes]
+/// Just a basic struct {thing}
+/// and this line should get ignored
+struct HappyStruct2 {
+    thing: &'static str,
+}
+
+#[derive(Display)]
+enum Happy {
+    /// I really like Variant1
+    Variant1,
+    /// Variant2 is pretty swell 2
+    Variant2,
+    /// Variant3 is okay {sometimes}
+    Variant3 { sometimes: &'static str },
+    /**
+     * Variant4 wants to have a lot of lines
+     *
+     * Lets see how this works out for it
+     */
+    Variant4,
+    /// Variant5 has a parameter {0} and some regular comments
+    // A regular comment that won't get picked
+    Variant5(u32),
+
+    /// These docs are ignored
+    #[displaydoc("Variant7 has a parameter {0} and uses #[displaydoc]")]
+    /// These docs are also ignored
+    Variant7(u32),
+}