diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 727d4bb3..a8f0dd89 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -93,7 +93,12 @@ jobs:
       uses: actions-rs/cargo@v1
       with:
         command: test
-        args: --all --verbose
+        args: --all --verbose --release
+    - name: Cargo test (run ignored)
+      uses: actions-rs/cargo@v1
+      with:
+        command: test
+        args: -p pest_grammars --lib --verbose --release -- --ignored tests::toml_handles_deep_nesting_unstable
 
   coverage:
     name: Test Coverage
diff --git a/grammars/fuzz/fuzz_targets/toml.rs b/grammars/fuzz/fuzz_targets/toml.rs
index 9e2389ac..9a4903b8 100644
--- a/grammars/fuzz/fuzz_targets/toml.rs
+++ b/grammars/fuzz/fuzz_targets/toml.rs
@@ -11,7 +11,7 @@ fuzz_target!(|data: &[u8]| {
     use pest_grammars::Parser;
 
     if let Ok(s) = std::str::from_utf8(data) {
-        pest::set_call_limit(Some(100_000usize.try_into().unwrap()));
+        pest::set_call_limit(Some(5_000usize.try_into().unwrap()));
         let _ = toml::TomlParser::parse(toml::Rule::toml, s);
     }
 });
diff --git a/grammars/resources/test/tomlfuzzsample2.toml b/grammars/resources/test/tomlfuzzsample2.toml
new file mode 100644
index 00000000..05b697c4
--- /dev/null
+++ b/grammars/resources/test/tomlfuzzsample2.toml
@@ -0,0 +1,5 @@
+[1]O=[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[{x=1,O=[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[{x=1,O=8,x=6,O=5,z=8,Ox4=[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[{x=0,O=8,x=6,O=5,z=8,Ox3=[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[{x=1,O=[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[{x=1,O=[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[{x=1,O=8,x=6,O=0,z=8,Ox3=[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[{x=0,O=8,x=6,O=5,z=8,Ox3=[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[{x=1,O=[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[{x=0,O=8,x=6,O=5,z=8,Ox3r=[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[{x=1,O=8,x=5,O=5,z=8,Ox3=[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[{x=4294967297,O=8,x=6,O=5,z=8,Ox3r=[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[{x=1,O=8,x=5,O=5,z=8,Ox3=[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[{x=1,O=[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[{x=1,O=8,x=6,O=5,z=8,Ox4=[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[{x=0,O=8,x=6,O=5,z=8,Ox3=[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[{x=1,O=[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[{x=1,O=[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[{x=1,O=8,x=6,O=0,z=8,Ox3=[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[{x=0,O=8,x=6,O=5,z=8,Ox3=[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[{x=1,O=[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[{x=0,O=8,x=6,O=5,z=8,Ox3r=[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[{x=1,O=8,x=5,O=5,z=8,Ox3=[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[{x=1,O=8,x=6,O=0,z=8,Ox3=[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[{x=0,O=8,x=6,O=5,z=8,Ox3=[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[{x=1,O=[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[{x=0,O=8,x=6,O=5,z=8,Ox3r=[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[{x=1,O=8,x=5,O=5,z=8,Ox3=[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[{x=4294967297,O=8,x=6,O=5,z=8,Ox3r=[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[{x=1,O=8,x=5,O=5,z=8,Ox3=[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[{x=1,O=[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[{x=1,O=8,x=6,O=5,z=8,Ox4=[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[{x=0,O=8,x=6,O=5,z=8,Ox3=[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[{x=1,O=[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[{x=1,O=[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[{x=1,O=8,x=6,O=0,z=8,Ox3=[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[{x=0,O=8,x=6,O=5,z=8,Ox3=[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[{x=1,O=[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[{x=0,O=8,x=6,O=5,z=8,Ox3r=[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[{x=1,O=8,x=5,O=5,z=8,Ox3=[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[{x=4294967297,O=8,x=6,O=5,z=8,Ox3r=[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[{x=1,O=8,x=5,O=5,z=8,Ox3=[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[{x=1,O=[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[{x=1,O=8,x=6,O=5,z=8,Ox4=[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[{x=0,O=8,x=6,O=5,z=8,Ox3=[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[{x=1,O=[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[{x=1,O=[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[{x=1,O=8,x=6,O=0,z=8,Ox3=[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[{x=0,O=8,x=6,O=5,z=8,Ox3=[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[{x=1,O=[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[{x=0,O=8,x=6,O=5,z=8,Ox3r=[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[{x=1,O=8,x=5,O=5,z=8,Ox3=[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[{x=4294967297,O=8,x=6,O=5,z=8,Ox3r=[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[{x=1,O=8,x=5,O=5,z=8,Ox3=[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[{x=1,O=[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[{x=1,O=8,x=6,O=5,z=8,Ox4=[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[{x=0,O=8,x=6,O=5,z=8,Ox3=[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[{x=1,O=[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[{x=1,O=[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[{x=1,O=8,x=6,O=0,z=8,Ox3=[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[{x=0,O=8,x=6,O=5,z=8,Ox3=[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[{x=1,O=[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[{x=0,O=8,x=6,O=5,z=8,Ox3r=[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[{x=1,O=8,x=5,O=5,z=8,Ox3=[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[{x=4294967297,O=8,x=6,O=5,z=8,Ox3r=[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[7297,O=8,x=6,O=5,z=8,Ox3r=[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[O=8,x=5,O=5,z=8,Ox3=[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[{x=1,O=8,x=5,O=5,z=8,Ox3=[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[1,5,
+
+[1,5
+,5
+,170141183460469231731687303715916988704O=8
\ No newline at end of file
diff --git a/grammars/src/lib.rs b/grammars/src/lib.rs
index 83b642e6..6c6285ad 100644
--- a/grammars/src/lib.rs
+++ b/grammars/src/lib.rs
@@ -41,17 +41,31 @@ mod tests {
 
     use crate::{json, toml};
 
+    fn test_toml_deep_nesting(input: &str) {
+        const ERROR: &str = "call limit reached";
+        pest::set_call_limit(Some(5_000usize.try_into().unwrap()));
+        let s = toml::TomlParser::parse(toml::Rule::toml, input);
+        assert!(s.is_err());
+        assert_eq!(s.unwrap_err().variant.message(), ERROR);
+    }
+
     #[test]
     fn toml_handles_deep_nesting() {
         let sample1 = include_str!(concat!(
             env!("CARGO_MANIFEST_DIR"),
             "/resources/test/tomlfuzzsample1.toml"
         ));
-        const ERROR: &str = "call limit reached";
-        pest::set_call_limit(Some(100_000usize.try_into().unwrap()));
-        let s1 = toml::TomlParser::parse(toml::Rule::toml, sample1);
-        assert!(s1.is_err());
-        assert_eq!(s1.unwrap_err().variant.message(), ERROR);
+        test_toml_deep_nesting(sample1);
+    }
+
+    #[test]
+    #[ignore = "this sometimes crashes in the debug mode"]
+    fn toml_handles_deep_nesting_unstable() {
+        let sample2 = include_str!(concat!(
+            env!("CARGO_MANIFEST_DIR"),
+            "/resources/test/tomlfuzzsample2.toml"
+        ));
+        test_toml_deep_nesting(sample2);
     }
 
     #[test]