Mitigate linker error from Rust compiler

CHANGELOG.md

@@ -1,15 +1,21 @@
 # Changelog
 
+### v0.12.1
+
+- Implemented a workaround that mitigates the linker error from Rust compiler (https://github.com/rust-lang/rust/issues/111888).
+
 ## v0.12.0
 
 ### Other Changes:
+
 - Added Server-side Rendering Support.
 - Fixed a reference cycle between `Style` and `StyleManager`.
 - Added `StyleManager::new()` to create a style manager with default configuration.
 
 ## v0.11.0
 
 ### Breaking Changes:
+
 - Yew version is bumped to v0.20.
 - Remove `YieldStyle`. This API can be easily reproduced in user code, if need be,
  but often leads to clumsy code in struct components. Use alternative API and prefer
@@ -24,22 +30,26 @@
  runtime.
 
 ### Other Changes:
+
 - The `Style::new_*` API is more open for accepted types of the `Css` parameter.
 - The name of styled components now defaults to the name of the function, like in
  `function_component`.
 
 ## v0.10.1
 
 ### Other Changes:
+
 - Added an impl of `IntoPropValue<Classes>` for `Style` and `StyleSource` when
  the `yew_integration` feature is active.
 
 ## v0.10.0
 
 ### Breaking Changes:
+
 - Yew version is bumped to 0.19.
 
 ### Other Changes:
+
 - Added an API to style Yew Function Component.
 - `random` features is now provided with `fastrand`.
 - Added Yew hooks for Media Query.
@@ -48,16 +58,19 @@
 ## v0.9.2
 
 ### Other Changes:
+
 - Fixed a misconfiguration causing documentation fails to build on `docs.rs`.
 
 ## v0.9.1
 
 ### Other Changes:
+
 - Removed an unused import.
 
 ## v0.9
 
 ### Breaking Changes:
+
 - `Style` and `GlobalStyle` no longer implements `FromStr`.
 - `Style` and `GlobalStyle` now takes any type that implements
  `Into<StyleSource>` as a source for a stylesheet.
@@ -67,6 +80,7 @@
  `@media`.
 
 ### Other Changes:
+
 - Added a Procedural Macro API that parses the Stylesheet at the compile
  time.
 - Parser will now check stylesheets more strictly.
@@ -82,16 +96,18 @@
 ## v0.8
 
 ### Breaking Changes:
+
 - `Style::new()` and `Style::create()` now takes a new trait `IntoSheet` for
  Stylesheet which is implemented by default for both
-`stylist::ast::Sheet` and everything that implements `AsRef<str>`.
+ `stylist::ast::Sheet` and everything that implements `AsRef<str>`.
 - Feature `yew` has been renamed back to `yew_integration`.
 - Selectors list now gets a class name added for each selector.
 - `Style` is now `!Send` and `!Sync`.
 - Stylist now treats pseudo class selectors (e.g.:`:hover`) like emotion
  and styled-components.
 
 ### Other Changes:
+
 - Added a `GlobalStyle` struct to register global styles.
 - Added a `<Global />` Component for global styling for yew applications.
 - Supported `@supports` CSS at-rule.
@@ -107,6 +123,7 @@
 ## v0.7
 
 ### Breaking Changes:
+
 - `Style::new()` now takes an `Into<Cow<'static, str>>` instead of
  `Into<String>` and returns `stylist::Error` instead of `String` when
  encountering an error.
@@ -116,6 +133,7 @@
 - `Style` no longer implements `ToString`.
 
 ### Other Changes:
+
 - Added a new API `YieldStyle`.
 - Added theming examples.
 - Styles are now cached by default.
@@ -125,15 +143,16 @@
 - Removed Unnecessary Clones.
 - Optimised for Performance.
 
-
 ## v0.6
 
 ### Breaking Changes:
+
 - `style.get_class_name()` no longer consumes the style and returns a `&str`
  instead of an owned string.
 - Seed Integration is Removed.
 
 ### Other Changes:
+
 - Added `Style::new` which does not require a component name.
 - Aesthetically pleasing Class Name.
 - Replaced `lazy_static` with `once_cell`.

packages/stylist-core/Cargo.toml

@@ -37,3 +37,4 @@ wasm-bindgen-test = "0.3.33"
 
 [features]
 parser = ["dep:nom"]
+__proc_macro_workaround = []

packages/stylist-core/src/ast/context.rs

@@ -73,9 +73,7 @@ impl<'a> StyleContext<'a> {
 
  /// Calculate the layers that current context differs from the parent context
  fn unique_conditions(&self) -> impl Iterator<Item = &str> {
- self.conditions()
- .into_iter()
- .skip(self.common_conditions().count())
+ self.conditions().skip(self.common_conditions().count())
  }
 
  /// Calculate the layers that parent context differs from current context

packages/stylist-core/src/error.rs

@@ -1,5 +1,23 @@
 use thiserror::Error;
 
+// This is a mitigation to a compiler bug: https://github.com/rust-lang/rust/issues/111888
+//
+// Feature `__proc_macro_workaround` is enabled for the workspace as `stylist-macros` enables it.
+// This is the workspace feature merging behaviour even if resolver 2 is enabled.
+// Enabling this feature for workspace will render browser tests uncompilable.
+//
+// To mitigate this side effect, we do not enable this feature on stylist-macros for wasm32 targets
+// to make sure tests can run with default feature merging behaviour.
+//
+// For crates outside of this workspace, `__proc_macro_workaround` will not be enabled
+// when they use version = "2021" or resolver = "2" as procedural macros can have different feature
+// flags. This should be OK for all downstream crates as stylist requires Rust 1.60 which supports
+// both.
+#[cfg(not(feature = "__proc_macro_workaround"))]
+type JsValue = wasm_bindgen::JsValue;
+#[cfg(feature = "__proc_macro_workaround")]
+type JsValue = ();
+
 #[derive(Debug, Error, PartialEq)]
 pub enum Error {
  /// Failed to parse CSS.
@@ -16,7 +34,7 @@ pub enum Error {
  ///
  /// This is usually raised when the style element failed to mount.
  #[error("Failed to Interact with Web API. Are you running in Browser?")]
- Web(Option<wasm_bindgen::JsValue>),
+ Web(Option<JsValue>),
 
  /// Failed to read styles from the StyleManager.
  ///

packages/stylist-macros/Cargo.toml

@@ -25,8 +25,6 @@ rust-version = "1.60"
 proc-macro = true
 
 [dependencies]
-stylist-core = { path = "../stylist-core", version = "0.12", features = ["parser"] }
-
 litrs = "0.4.0"
 proc-macro-error = "1.0.4"
 proc-macro2 = "1.0.47"
@@ -36,5 +34,11 @@ syn = { version = "1.0.105", features = ["full", "extra-traits"] }
 itertools = "0.10.5"
 log = "0.4.17"
 
+[target.'cfg(not(target_arch = "wasm32"))'.dependencies]
+stylist-core = { path = "../stylist-core", version = "0.12", features = ["parser", "__proc_macro_workaround"] }
+
+[target.'cfg(target_arch = "wasm32")'.dependencies]
+stylist-core = { path = "../stylist-core", version = "0.12", features = ["parser"] }
+
 [dev-dependencies]
 env_logger = "0.10.0"