Wrap up 0.19.10.

Cargo.toml

@@ -11,7 +11,7 @@ edition = "2018"
 authors = ["Jonathan Turner", "Lukáš Hozda", "Stephen Chung", "jhwgh1968"]
 description = "Embedded scripting for Rust"
 homepage = "https://rhaiscript.github.io/book"
-repository = "https://github.com/rhaiscript/rhai"
+repository = "https://github.com/rhaiscript"
 readme = "README.md"
 license = "MIT OR Apache-2.0"
 include = [

README.md

@@ -70,15 +70,13 @@ Documentation
 
 See [The Rhai Book](https://rhaiscript.github.io/book) for details on the Rhai scripting engine and language.
 
-To build _The Book_, first install [`mdbook`](https://github.com/rust-lang/mdBook)
-and [`mdbook-tera`](https://github.com/avitex/mdbook-tera) (for templating).
-Running `mdbook build` builds it.
-
 
 Playground
 ----------
 
-An [Online Playground](https://rhaiscript.github.io/playground) is available with syntax-highlighting editor.
+An [Online Playground](https://rhaiscript.github.io/playground) is available with
+syntax-highlighting editor, powered by WebAssembly.
+
 Scripts can be evaluated directly from the editor.
 
 

RELEASES.md

@@ -7,8 +7,9 @@ Version 0.19.10
 Bug fixes
 ---------
 
+* `no_std` feature now compiles correctly (bug introduced in `0.19.9`).
 * Bug in `FileModuleResolver::clear_cache_for_path` path mapping fixed.
-* Some optimizer fringe cases is fixed - related to constants propagation when the evil `eval` is present.
+* Some optimizer fringe cases are fixed - related to constants propagation when the evil `eval` is present.
 
 Breaking changes
 ----------------

src/ast.rs

@@ -1058,13 +1058,13 @@ impl Stmt {
     }
 }
 
-/// _(INTERNALS)_ A custom syntax definition.
+/// _(INTERNALS)_ A custom syntax expression.
 /// Exported under the `internals` feature only.
 ///
 /// # WARNING
 ///
 /// This type is volatile and may change.
-#[derive(Clone, Hash)]
+#[derive(Debug, Clone, Hash)]
 pub struct CustomExpr {
     /// List of keywords.
     pub keywords: StaticVec<Expr>,
@@ -1074,17 +1074,6 @@ pub struct CustomExpr {
     pub scope_delta: isize,
 }
 
-impl fmt::Debug for CustomExpr {
-    #[inline(always)]
-    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
-        f.write_str("CustomExpr { keywords:")?;
-        fmt::Debug::fmt(&self.keywords, f)?;
-        f.write_str(", tokens:")?;
-        fmt::Debug::fmt(&self.tokens, f)?;
-        f.write_str("}")
-    }
-}
-
 /// _(INTERNALS)_ A binary expression.
 /// Exported under the `internals` feature only.
 ///

src/syntax.rs

@@ -101,6 +101,14 @@ impl Engine {
     /// * `keywords` holds a slice of strings that define the custom syntax.  
     /// * `new_vars` is the number of new variables declared by this custom syntax, or the number of variables removed (if negative).
     /// * `func` is the implementation function.
+    ///
+    /// # Notes
+    ///
+    /// If `new_vars` is positive, then a number of new variables are expected to be pushed into the
+    /// current [`Scope`][crate::Scope].
+    ///
+    /// If `new_vars` is negative, then it is expected that only the top `new_vars` variables in the
+    /// current [`Scope`][crate::Scope] will be _popped_.  Do not randomly remove variables.
     pub fn register_custom_syntax<S: AsRef<str> + Into<ImmutableString>>(
         &mut self,
         keywords: impl AsRef<[S]>,