diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 7de828b7..ce388b05 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -55,6 +55,24 @@ jobs:
         if: matrix.cpp_compiler == 'g++'
         run: cargo xtask ci
 
+  build-nightly:
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+    env:
+      CXX: g++
+    steps:
+      - uses: actions/checkout@v3
+      - uses: jdx/mise-action@v3
+      - name: Install Rust nightly
+        run: |
+          rustup toolchain install nightly
+          rustup default nightly
+          rustup target add wasm32-wasip1
+          rustup component add rustfmt
+      - name: Run CI (g++ nightly)
+        run: cargo xtask ci
+
   build-win:
     runs-on: windows-2022
     steps:
diff --git a/zngur-parser/src/conditional.rs b/zngur-parser/src/conditional.rs
index 04a02a05..b1e15642 100644
--- a/zngur-parser/src/conditional.rs
+++ b/zngur-parser/src/conditional.rs
@@ -10,7 +10,7 @@ pub trait Matchable: core::fmt::Debug + Clone + PartialEq + Eq {
 }
 
 /// a type that can be matched against a Pattern
-pub trait MatchableParse<'src>: Matchable {
+pub(crate) trait MatchableParse<'src>: Matchable {
     /// return a parser for the item as it would appear in an `#if` or `#match` statement
     fn parser() -> impl ZngParser<'src, Self>;
 
@@ -28,7 +28,7 @@ pub trait MatchPattern: core::fmt::Debug + Clone + PartialEq + Eq {
 }
 
 /// a Pattern that can be matched against
-pub trait MatchPatternParse<'src>: MatchPattern {
+pub(crate) trait MatchPatternParse<'src>: MatchPattern {
     /// return a parser for for the pattern
     fn parser() -> impl ZngParser<'src, Self>;
 }
diff --git a/zngur-parser/src/lib.rs b/zngur-parser/src/lib.rs
index 6d8cc899..0b2894a9 100644
--- a/zngur-parser/src/lib.rs
+++ b/zngur-parser/src/lib.rs
@@ -71,7 +71,10 @@ type ZngParserExtra<'a> =
 type BoxedZngParser<'a, Item> = chumsky::Boxed<'a, 'a, ParserInput<'a>, Item, ZngParserExtra<'a>>;
 
 /// Effective trait alias for verbose chumsky Parser Trait
-trait ZngParser<'a, Item>: Parser<'a, ParserInput<'a>, Item, ZngParserExtra<'a>> + Clone {}
+pub(crate) trait ZngParser<'a, Item>:
+    Parser<'a, ParserInput<'a>, Item, ZngParserExtra<'a>> + Clone
+{
+}
 impl<'a, T, Item> ZngParser<'a, Item> for T where
     T: Parser<'a, ParserInput<'a>, Item, ZngParserExtra<'a>> + Clone
 {