Update to Rust 2021 (#309)

CHANGELOG.md

@@ -6,6 +6,8 @@
   [#303](https://github.com/lambda-fairy/maud/pull/303)
 - Add support for `Option<T>` attributes using the `attr=[value]` syntax.
   [#306](https://github.com/lambda-fairy/maud/pull/306)
+- Update to Rust 2021
+  [#309](https://github.com/lambda-fairy/maud/pull/309)
 
 ## [0.22.3] - 2021-09-27
 

docs/content/elements-attributes.md

@@ -160,6 +160,24 @@ html! {
 # ;
 ```
 
+In Rust 2021,
+the `#` symbol must be preceded by a space,
+to avoid conflicts with [reserved syntax]:
+
+[reserved syntax]: https://doc.rust-lang.org/edition-guide/rust-2021/reserving-syntax.html
+
+```rust,edition2018
+# let _ = maud::
+html! {
+    // Works on all Rust editions
+    input #pinkie;
+
+    // Works on Rust 2018 and older only
+    input#pinkie;
+}
+# ;
+```
+
 The classes and IDs can be quoted.
 This is useful for names with numbers or symbols
 which otherwise wouldn't parse:

maud/Cargo.toml

@@ -9,7 +9,7 @@ homepage = "https://maud.lambda.xyz/"
 repository = "https://github.com/lambda-fairy/maud"
 description = "Compile-time HTML templates."
 categories = ["template-engine"]
-edition = "2018"
+edition = "2021"
 
 [features]
 default = []

maud/tests/basic_syntax.rs

@@ -197,7 +197,7 @@ fn class_shorthand() {
 }
 
 #[test]
-fn class_shorthand_with_space() {
+fn class_shorthand_without_space() {
     let result = html! { p { "Hi, " span.name { "Lyra" } "!" } };
     assert_eq!(
         result.into_string(),

maud_htmlescape/Cargo.toml

@@ -8,7 +8,7 @@ documentation = "https://docs.rs/maud_htmlescape/"
 homepage = "https://maud.lambda.xyz/"
 repository = "https://github.com/lambda-fairy/maud"
 description = "Internal support code used by Maud."
-edition = "2018"
+edition = "2021"
 
 [lib]
 path = "lib.rs"

maud_macros/Cargo.toml

@@ -8,7 +8,7 @@ documentation = "https://docs.rs/maud_macros/"
 homepage = "https://maud.lambda.xyz/"
 repository = "https://github.com/lambda-fairy/maud"
 description = "Compile-time HTML templates."
-edition = "2018"
+edition = "2021"
 
 [dependencies]
 syn = "1.0.8"