fix(CI): free-up disk, properly gate nightly feature and pre-install deps (#3735)

* fix(CI): pre-install tailwind and sass

* chore: retrigger CI

* fix(CI): properly set `erased_mode` in examples

* fix(CI): workflow logic install deps locally

* chore(CI): organized tailwind and sass versions

* fix: properly ignore nightly features on stable rustc

* fix(CI): typo

* fix: missing cfg attr

* fix: properly gate nightly module in `reactive_graph``

* fix: complete `rustc_nightly` cfg gate

* fix(CI): making even more space for CI workers

* fix: missing one more rustc_nightly gated feature

* fix: maximize the speed of cargo-all-features by limiting combinations to 2

.github/workflows/get-changed-examples-matrix.yml

@@ -1,5 +1,4 @@
 name: Changed Examples Matrix Call
-
 on:
   workflow_call:
     inputs:
@@ -11,7 +10,6 @@ on:
       matrix:
         description: "Matrix"
         value: ${{ jobs.get-example-changed.outputs.matrix }}
-
 jobs:
   get-example-changed:
     name: Get Changed Example Matrix
@@ -23,7 +21,6 @@ jobs:
         uses: actions/checkout@v4
         with:
           fetch-depth: 0
-
       - name: Get example project directories that changed
         id: changed-dirs
         uses: tj-actions/changed-files@v45
@@ -38,17 +35,17 @@ jobs:
             !examples/*.md
           json: true
           quotepath: false
-
       - name: List example project directories that changed
         run: echo '${{ steps.changed-dirs.outputs.all_changed_files }}'
-
       - name: Set Matrix
         id: set-matrix
         run: |
           if [ ${{ inputs.example_changed }} == 'true' ]; then
             # Create matrix with changed directories
-            echo "matrix={\"directory\":${{ steps.changed-dirs.outputs.all_changed_files }}}" >> "$GITHUB_OUTPUT"
+            directories="${{ steps.changed-dirs.outputs.all_changed_files }}"
           else
+            directories="NO_CHANGE"
             # Create matrix with one item to prevent an empty vector error
-            echo "matrix={\"directory\":[\"NO_CHANGE\"], \"erased_mode\": [false, true]}" >> "$GITHUB_OUTPUT"
           fi
+
+          echo "matrix={\"directory\":"$directories", \"erased_mode\": [false, true]}" >> "$GITHUB_OUTPUT"

.github/workflows/run-cargo-make-task.yml

@@ -19,6 +19,8 @@ env:
   CARGO_REGISTRIES_CRATES_IO_PROTOCOL: sparse
   DEBIAN_FRONTEND: noninteractive
   RUSTFLAGS: ${{ inputs.erased_mode && '--cfg erase_components' || '' }}
+  LEPTOS_TAILWIND_VERSION: v4.0.14
+  LEPTOS_SASS_VERSION: 1.86.0
 jobs:
   test:
     name: "Run ${{ inputs.cargo_make_task }} (${{ inputs.toolchain }}) (erased_mode: ${{ inputs.erased_mode }})"
@@ -30,11 +32,19 @@ jobs:
           df -h
           sudo rm -rf /usr/local/.ghcup
           sudo rm -rf /opt/hostedtoolcache/CodeQL
-          sudo rm -rf /usr/local/lib/android/sdk/ndk
+          sudo rm -rf /usr/local/lib/android
           sudo rm -rf /usr/share/dotnet
           sudo rm -rf /opt/ghc
           sudo rm -rf /usr/local/share/boost
+          sudo rm -rf /usr/local/lib/node_modules
           sudo apt-get clean
+          sudo apt-get purge -y '^ghc-.*' '^dotnet-.*' '^llvm-.*' '^mono-.*' '^php.*' '^ruby.*'
+          sudo apt-get autoremove -y
+          sudo apt-get clean
+          sudo rm -rf "$AGENT_TOOLSDIRECTORY"
+          docker system prune -af
+          docker image prune -af
+          docker volume prune -f
           echo "Disk space after cleanup:"
           df -h
       # Setup environment
@@ -125,8 +135,26 @@ jobs:
             sudo apt-get update
             sudo apt-get install -y libglib2.0-dev libgio2.0-cil-dev libgraphene-1.0-dev libcairo2-dev libpango1.0-dev libgtk-4-dev
           fi
+      - name: Enter ${{ inputs.directory }}
+        run: |
+          cd ${{ inputs.directory }}
+      - name: Install Tailwind and Sass dependencies
+        if: contains(inputs.directory, 'examples')
+        run: |
+          tailwindcss_version=$(echo "$LEPTOS_TAILWIND_VERSION" | sed 's/^v//')
+          sass_version="$LEPTOS_SASS_VERSION"
+          pnpm add "tailwindcss@$tailwindcss_version" "@tailwindcss/cli@$tailwindcss_version" "sass@$sass_version"
+
+          echo "Tailwind CSS version:"
+          ./node_modules/.bin/tailwindcss --version
+
+          echo "Sass version:"
+          ./node_modules/.bin/sass --version
       # Run Cargo Make Task
       - name: ${{ inputs.cargo_make_task }}
         run: |
-          cd ${{ inputs.directory }}
           cargo make --profile=github-actions ${{ inputs.cargo_make_task }}
+      - name: Clean up ${{ inputs.directory }}
+        run: |
+          cargo clean || true
+          rm -rf node_modules || true

Cargo.lock

@@ -1796,6 +1796,7 @@ dependencies = [
  "rand 0.8.5",
  "reactive_graph",
  "rustc-hash 2.1.1",
+ "rustc_version",
  "send_wrapper",
  "serde",
  "serde_json",
@@ -1953,6 +1954,7 @@ dependencies = [
  "proc-macro2",
  "quote",
  "rstml",
+ "rustc_version",
  "serde",
  "server_fn",
  "server_fn_macro 0.8.0-beta",
@@ -1993,6 +1995,7 @@ dependencies = [
  "or_poisoned",
  "percent-encoding",
  "reactive_graph",
+ "rustc_version",
  "send_wrapper",
  "tachys",
  "thiserror 2.0.12",
@@ -2742,6 +2745,7 @@ dependencies = [
  "or_poisoned",
  "pin-project-lite",
  "rustc-hash 2.1.1",
+ "rustc_version",
  "send_wrapper",
  "serde",
  "slotmap",
@@ -3295,6 +3299,7 @@ dependencies = [
  "convert_case 0.6.0",
  "proc-macro2",
  "quote",
+ "rustc_version",
  "syn 2.0.100",
  "xxhash-rust",
 ]
@@ -3520,6 +3525,7 @@ dependencies = [
  "reactive_graph",
  "reactive_stores",
  "rustc-hash 2.1.1",
+ "rustc_version",
  "send_wrapper",
  "serde",
  "serde_json",

Cargo.toml

@@ -81,6 +81,7 @@ opt-level = 'z'
 
 [workspace.metadata.cargo-all-features]
 skip_feature_sets = [["csr", "ssr"], ["csr", "hydrate"], ["ssr", "hydrate"]]
+max_combination_size = 2
 
 [workspace.lints.rust]
 unexpected_cfgs = { level = "warn", check-cfg = [

any_spawner/Cargo.toml

@@ -34,3 +34,4 @@ rustdoc-args = ["--cfg", "docsrs"]
 
 [package.metadata.cargo-all-features]
 denylist = ["tracing"]
+max_combination_size = 2

examples/ssr_modes/src/app.rs

@@ -1,5 +1,3 @@
-use std::sync::LazyLock;
-
 use leptos::prelude::*;
 use leptos_meta::*;
 use leptos_router::{
@@ -9,6 +7,7 @@ use leptos_router::{
     ParamSegment, SsrMode, StaticSegment,
 };
 use serde::{Deserialize, Serialize};
+use std::sync::LazyLock;
 use thiserror::Error;
 
 #[component]

integrations/actix/Cargo.toml

@@ -39,3 +39,4 @@ tracing = ["dep:tracing"]
 
 [package.metadata.cargo-all-features]
 denylist = ["tracing"]
+max_combination_size = 2

integrations/axum/Cargo.toml

@@ -51,3 +51,4 @@ rustdoc-args = ["--generate-link-to-definition"]
 
 [package.metadata.cargo-all-features]
 denylist = ["tracing"]
+max_combination_size = 2

leptos/Cargo.toml

@@ -96,6 +96,9 @@ trace-component-props = [
 ]
 delegation = ["tachys/delegation"]
 
+[build-dependencies]
+rustc_version = "0.4.1"
+
 # Having an erasure feature rather than normal --cfg erase_components for the proc macro crate is a workaround for this rust issue:
 # https://github.com/rust-lang/cargo/issues/4423
 # TLDR proc macros will ignore RUSTFLAGS when --target is specified on the cargo command.
@@ -160,9 +163,13 @@ skip_feature_sets = [
     "rustls",
   ],
 ]
+max_combination_size = 2
 
 [package.metadata.docs.rs]
 rustdoc-args = ["--generate-link-to-definition"]
 
 [lints.rust]
-unexpected_cfgs = { level = "warn", check-cfg = ['cfg(leptos_debuginfo)'] }
+unexpected_cfgs = { level = "warn", check-cfg = [
+  'cfg(leptos_debuginfo)',
+  'cfg(rustc_nightly)',
+] }

leptos/build.rs

@@ -0,0 +1,8 @@
+use rustc_version::{version_meta, Channel};
+
+fn main() {
+    // Set cfg flags depending on release channel
+    if matches!(version_meta().unwrap().channel, Channel::Nightly) {
+        println!("cargo:rustc-cfg=rustc_nightly");
+    }
+}

leptos/src/lib.rs

@@ -141,8 +141,8 @@
 //! }
 //! ```
 
-#![cfg_attr(feature = "nightly", feature(fn_traits))]
-#![cfg_attr(feature = "nightly", feature(unboxed_closures))]
+#![cfg_attr(all(feature = "nightly", rustc_nightly), feature(fn_traits))]
+#![cfg_attr(all(feature = "nightly", rustc_nightly), feature(unboxed_closures))]
 
 extern crate self as leptos;
 

leptos_dom/Cargo.toml

@@ -37,6 +37,7 @@ rustdoc-args = ["--generate-link-to-definition"]
 
 [package.metadata.cargo-all-features]
 denylist = ["tracing"]
+max_combination_size = 2
 
 [lints.rust]
 unexpected_cfgs = { level = "warn", check-cfg = ['cfg(leptos_debuginfo)'] }

leptos_dom/examples/hydration-test/Cargo.toml

@@ -19,3 +19,6 @@ futures = "0.3.0"
 default = ["ssr"]
 ssr = ["leptos/ssr", "dep:actix-files", "dep:actix-web"]
 hydrate = ["leptos/hydrate", "dep:wasm-bindgen", "dep:gloo"]
+
+[package.metadata.cargo-all-features]
+max_combination_size = 2

leptos_macro/Cargo.toml

@@ -39,6 +39,9 @@ server_fn = { path = "../server_fn", features = ["cbor"] }
 insta = "1.41"
 serde = "1.0"
 
+[build-dependencies]
+rustc_version = "0.4.1"
+
 [features]
 csr = []
 hydrate = []
@@ -87,6 +90,10 @@ skip_feature_sets = [
     "axum",
   ],
 ]
+max_combination_size = 2
 
 [package.metadata.docs.rs]
 rustdoc-args = ["--generate-link-to-definition"]
+
+[lints.rust]
+unexpected_cfgs = { level = "warn", check-cfg = ['cfg(rustc_nightly)'] }

leptos_macro/build.rs

@@ -0,0 +1,8 @@
+use rustc_version::{version_meta, Channel};
+
+fn main() {
+    // Set cfg flags depending on release channel
+    if matches!(version_meta().unwrap().channel, Channel::Nightly) {
+        println!("cargo:rustc-cfg=rustc_nightly");
+    }
+}

leptos_macro/src/lib.rs

@@ -1,6 +1,6 @@
 //! Macros for use with the Leptos framework.
 
-#![cfg_attr(feature = "nightly", feature(proc_macro_span))]
+#![cfg_attr(all(feature = "nightly", rustc_nightly), feature(proc_macro_span))]
 #![forbid(unsafe_code)]
 // to prevent warnings from popping up when a nightly feature is stabilized
 #![allow(stable_features)]
@@ -359,7 +359,7 @@ fn view_macro_impl(tokens: TokenStream, template: bool) -> TokenStream {
 
 fn normalized_call_site(site: proc_macro::Span) -> Option<String> {
     cfg_if::cfg_if! {
-        if #[cfg(all(debug_assertions, feature = "nightly"))] {
+        if #[cfg(all(debug_assertions, feature = "nightly", rustc_nightly))] {
             Some(leptos_hot_reload::span_to_stable_id(
                 site.source_file().path(),
                 site.start().line()

leptos_macro/src/view/component_builder.rs

@@ -327,9 +327,9 @@ fn is_attr_let(key: &NodeName) -> bool {
     }
 }
 
-pub fn items_to_clone_to_tokens<'a>(
-    items_to_clone: &'a [Ident],
-) -> impl Iterator<Item = TokenStream> + 'a {
+pub fn items_to_clone_to_tokens(
+    items_to_clone: &[Ident],
+) -> impl Iterator<Item = TokenStream> + '_ {
     items_to_clone.iter().map(|ident| {
         let ident_ref = quote_spanned!(ident.span()=> &#ident);
         quote! { let #ident = ::core::clone::Clone::clone(#ident_ref); }

leptos_macro/src/view/mod.rs

@@ -611,7 +611,7 @@ fn node_to_tokens(
 
 fn text_to_tokens(text: &LitStr) -> TokenStream {
     // on nightly, can use static string optimization
-    if cfg!(feature = "nightly") {
+    if cfg!(all(feature = "nightly", rustc_nightly)) {
         quote! {
             ::leptos::tachys::view::static_types::Static::<#text>
         }
@@ -1512,7 +1512,7 @@ fn attribute_value(
         Some(value) => match &value.value {
             KVAttributeValue::Expr(expr) => {
                 if let Expr::Lit(lit) = expr {
-                    if cfg!(feature = "nightly") {
+                    if cfg!(all(feature = "nightly", rustc_nightly)) {
                         if let Lit::Str(str) = &lit.lit {
                             return quote! {
                                 ::leptos::tachys::view::static_types::Static::<#str>

leptos_server/Cargo.toml

@@ -43,6 +43,7 @@ tracing = ["dep:tracing"]
 
 [package.metadata.cargo-all-features]
 denylist = ["tracing"]
+max_combination_size = 2
 
 [package.metadata.docs.rs]
 rustdoc-args = ["--generate-link-to-definition"]

meta/Cargo.toml

@@ -33,6 +33,7 @@ rustdoc-args = ["--generate-link-to-definition"]
 
 [package.metadata.cargo-all-features]
 denylist = ["tracing"]
+max_combination_size = 2
 
 [lints.rust]
 unexpected_cfgs = { level = "warn", check-cfg = ['cfg(leptos_debuginfo)'] }

reactive_graph/Cargo.toml

@@ -32,6 +32,9 @@ tokio = { version = "1.43", features = ["rt-multi-thread", "macros"] }
 tokio-test = { version = "0.4.4" }
 any_spawner = { workspace = true, features = ["futures-executor", "tokio"] }
 
+[build-dependencies]
+rustc_version = "0.4.1"
+
 [features]
 nightly = []
 serde = ["dep:serde"]
@@ -47,6 +50,10 @@ rustdoc-args = ["--cfg", "docsrs"]
 
 [package.metadata.cargo-all-features]
 denylist = ["tracing"]
+max_combination_size = 2
 
 [lints.rust]
-unexpected_cfgs = { level = "warn", check-cfg = ['cfg(leptos_debuginfo)'] }
+unexpected_cfgs = { level = "warn", check-cfg = [
+  'cfg(leptos_debuginfo)',
+  'cfg(rustc_nightly)',
+] }

reactive_graph/build.rs

@@ -0,0 +1,8 @@
+use rustc_version::{version_meta, Channel};
+
+fn main() {
+    // Set cfg flags depending on release channel
+    if matches!(version_meta().unwrap().channel, Channel::Nightly) {
+        println!("cargo:rustc-cfg=rustc_nightly");
+    }
+}

reactive_graph/src/lib.rs

@@ -68,8 +68,8 @@
 //! [Reactively](https://github.com/modderme123/reactively), as described
 //! [in this article](https://dev.to/modderme123/super-charging-fine-grained-reactive-performance-47ph).
 
-#![cfg_attr(feature = "nightly", feature(unboxed_closures))]
-#![cfg_attr(feature = "nightly", feature(fn_traits))]
+#![cfg_attr(all(feature = "nightly", rustc_nightly), feature(unboxed_closures))]
+#![cfg_attr(all(feature = "nightly", rustc_nightly), feature(fn_traits))]
 #![deny(missing_docs)]
 
 use std::{fmt::Arguments, future::Future};
@@ -92,7 +92,7 @@ pub mod wrappers;
 
 use computed::ScopedFuture;
 
-#[cfg(feature = "nightly")]
+#[cfg(all(feature = "nightly", rustc_nightly))]
 mod nightly;
 
 /// Reexports frequently-used traits.

router/Cargo.toml

@@ -56,6 +56,9 @@ features = [
   "Response",
 ]
 
+[build-dependencies]
+rustc_version = "0.4.1"
+
 [features]
 tracing = ["dep:tracing"]
 ssr = ["dep:percent-encoding"]
@@ -66,9 +69,11 @@ rustdoc-args = ["--generate-link-to-definition"]
 
 [package.metadata.cargo-all-features]
 denylist = ["tracing"]
+max_combination_size = 2
 
 [lints.rust]
 unexpected_cfgs = { level = "warn", check-cfg = [
   'cfg(leptos_debuginfo)',
   'cfg(erase_components)',
+  'cfg(rustc_nightly)',
 ] }

router/build.rs

@@ -0,0 +1,8 @@
+use rustc_version::{version_meta, Channel};
+
+fn main() {
+    // Set cfg flags depending on release channel
+    if matches!(version_meta().unwrap().channel, Channel::Nightly) {
+        println!("cargo:rustc-cfg=rustc_nightly");
+    }
+}

router/src/lib.rs

@@ -121,8 +121,8 @@
 
 #![forbid(unsafe_code)]
 #![deny(missing_docs)]
-#![cfg_attr(feature = "nightly", feature(auto_traits))]
-#![cfg_attr(feature = "nightly", feature(negative_impls))]
+#![cfg_attr(all(feature = "nightly", rustc_nightly), feature(auto_traits))]
+#![cfg_attr(all(feature = "nightly", rustc_nightly), feature(negative_impls))]
 
 /// Components for route definition and for enhanced links and forms.
 pub mod components;

router/src/params.rs

@@ -200,7 +200,7 @@ where
 }
 
 // TODO can we support Option<T> and T in a non-nightly way?
-#[cfg(feature = "nightly")]
+#[cfg(all(feature = "nightly", rustc_nightly))]
 mod option_param {
     use super::{IntoParam, ParamsError};
     use std::{str::FromStr, sync::Arc};

server_fn/Cargo.toml

@@ -231,6 +231,7 @@ skip_feature_sets = [
     "rkyv",
   ],
 ]
+max_combination_size = 2
 
 [lints.rust]
 unexpected_cfgs = { level = "warn", check-cfg = ['cfg(leptos_debuginfo)'] }

server_fn/server_fn_macro_default/Cargo.toml

@@ -19,3 +19,6 @@ nightly = ["server_fn_macro/nightly"]
 ssr = ["server_fn_macro/ssr"]
 actix = ["server_fn_macro/actix"]
 axum = ["server_fn_macro/axum"]
+
+[package.metadata.cargo-all-features]
+max_combination_size = 2

server_fn_macro/Cargo.toml

@@ -16,6 +16,11 @@ xxhash-rust = { version = "0.8.12", features = ["const_xxh64"] }
 const_format = "0.2.33"
 convert_case = "0.6.0"
 
+
+[build-dependencies]
+rustc_version = "0.4.1"
+
+
 [features]
 nightly = []
 ssr = []
@@ -26,3 +31,9 @@ reqwest = []
 
 [package.metadata.docs.rs]
 rustdoc-args = ["--generate-link-to-definition"]
+
+[package.metadata.cargo-all-features]
+max_combination_size = 2
+
+[lints.rust]
+unexpected_cfgs = { level = "warn", check-cfg = ['cfg(rustc_nightly)'] }

server_fn_macro/build.rs

@@ -0,0 +1,8 @@
+use rustc_version::{version_meta, Channel};
+
+fn main() {
+    // Set cfg flags depending on release channel
+    if matches!(version_meta().unwrap().channel, Channel::Nightly) {
+        println!("cargo:rustc-cfg=rustc_nightly");
+    }
+}

server_fn_macro/src/lib.rs

@@ -1,4 +1,4 @@
-#![cfg_attr(feature = "nightly", feature(proc_macro_span))]
+#![cfg_attr(all(feature = "nightly", rustc_nightly), feature(proc_macro_span))]
 #![forbid(unsafe_code)]
 #![deny(missing_docs)]
 

tachys/Cargo.toml

@@ -169,6 +169,9 @@ serde_json = { version = "1", optional = true }
 tokio-test = "0.4.4"
 tokio = { version = "1.43", features = ["rt", "macros"] }
 
+[build-dependencies]
+rustc_version = "0.4.1"
+
 [features]
 default = ["testing"]
 delegation = []                                                       # enables event delegation
@@ -200,9 +203,11 @@ skip_feature_sets = [
     "delegation",
   ],
 ]
+max_combination_size = 2
 
 [lints.rust]
 unexpected_cfgs = { level = "warn", check-cfg = [
   'cfg(leptos_debuginfo)',
   'cfg(erase_components)',
+  'cfg(rustc_nightly)',
 ] }

tachys/build.rs

@@ -0,0 +1,8 @@
+use rustc_version::{version_meta, Channel};
+
+fn main() {
+    // Set cfg flags depending on release channel
+    if matches!(version_meta().unwrap().channel, Channel::Nightly) {
+        println!("cargo:rustc-cfg=rustc_nightly");
+    }
+}

tachys/src/html/attribute/custom.rs

@@ -170,7 +170,7 @@ impl CustomAttributeKey for Arc<str> {
     const KEY: &'static str = "";
 }
 
-#[cfg(feature = "nightly")]
+#[cfg(all(feature = "nightly", rustc_nightly))]
 impl<const K: &'static str> CustomAttributeKey
     for crate::view::static_types::Static<K>
 {

tachys/src/html/attribute/value.rs

@@ -202,7 +202,7 @@ impl<'a> AttributeValue for &'a str {
     }
 }
 
-#[cfg(feature = "nightly")]
+#[cfg(all(feature = "nightly", rustc_nightly))]
 impl<const V: &'static str> AttributeValue
     for crate::view::static_types::Static<V>
 {

tachys/src/html/class.rs

@@ -571,7 +571,7 @@ impl IntoClass for (&'static str, bool) {
     }
 }
 
-#[cfg(feature = "nightly")]
+#[cfg(all(feature = "nightly", rustc_nightly))]
 impl<const V: &'static str> IntoClass for crate::view::static_types::Static<V> {
     const TEMPLATE: &'static str = V;
 

tachys/src/html/element/mod.rs

@@ -745,7 +745,7 @@ where
 /*
 #[cfg(all(test, feature = "testing"))]
 mod tests {
-    #[cfg(feature = "nightly")]
+    #[cfg(all(feature = "nightly", rustc_nightly))]
     use super::RenderHtml;
     use super::{main, p, HtmlElement};
     use crate::{
@@ -782,7 +782,7 @@ mod tests {
         );
     }
 
-    #[cfg(feature = "nightly")]
+    #[cfg(all(feature = "nightly", rustc_nightly))]
     #[test]
     fn html_render_allocates_appropriate_buffer() {
         use crate::view::static_types::Static;

tachys/src/html/style.rs

@@ -2,7 +2,7 @@ use super::attribute::{
     maybe_next_attr_erasure_macros::next_attr_output_type, Attribute,
     NextAttribute,
 };
-#[cfg(feature = "nightly")]
+#[cfg(all(feature = "nightly", rustc_nightly))]
 use crate::view::static_types::Static;
 use crate::{
     html::attribute::maybe_next_attr_erasure_macros::next_attr_combine,
@@ -661,7 +661,7 @@ impl_style_value!(String);
 #[cfg(feature = "oco")]
 impl_style_value!(oco_ref::Oco<'static, str>);
 
-#[cfg(feature = "nightly")]
+#[cfg(all(feature = "nightly", rustc_nightly))]
 impl<const V: &'static str> IntoStyleValue for Static<V> {
     type AsyncOutput = Self;
     type State = Self;
@@ -707,7 +707,7 @@ impl<const V: &'static str> IntoStyleValue for Static<V> {
     }
 }
 
-#[cfg(feature = "nightly")]
+#[cfg(all(feature = "nightly", rustc_nightly))]
 impl<const V: &'static str> IntoStyleValue for Option<Static<V>> {
     type AsyncOutput = Self;
     type State = Self;
@@ -764,7 +764,7 @@ impl<const V: &'static str> IntoStyleValue for Option<Static<V>> {
     }
 }
 
-#[cfg(feature = "nightly")]
+#[cfg(all(feature = "nightly", rustc_nightly))]
 impl<const V: &'static str> IntoStyle for crate::view::static_types::Static<V> {
     type AsyncOutput = Self;
     type State = ();

tachys/src/lib.rs

@@ -6,7 +6,10 @@
 // this is specifically used for `unsized_const_params` below
 // this allows us to use const generic &'static str for static text nodes and attributes
 #![allow(incomplete_features)]
-#![cfg_attr(feature = "nightly", feature(unsized_const_params))]
+#![cfg_attr(
+    all(feature = "nightly", rustc_nightly),
+    feature(unsized_const_params)
+)]
 #![deny(missing_docs)]
 
 /// Commonly-used traits.

tachys/src/view/mod.rs

@@ -22,7 +22,7 @@ pub mod iterators;
 pub mod keyed;
 mod primitives;
 /// Optimized types for static strings known at compile time.
-#[cfg(feature = "nightly")]
+#[cfg(all(feature = "nightly", rustc_nightly))]
 pub mod static_types;
 /// View implementation for string types.
 pub mod strings;