diff --git a/.github/workflows/benchmark.yml b/.github/workflows/benchmark.yml
new file mode 100644
index 0000000..7600f6e
--- /dev/null
+++ b/.github/workflows/benchmark.yml
@@ -0,0 +1,33 @@
+name: Benchmark
+
+on: [push, pull_request]
+
+jobs:
+  build:
+
+    strategy:
+      matrix:
+        os: [ubuntu-latest]
+        rust: [stable]
+
+    runs-on: ${{ matrix.os }}
+
+    steps:
+    - name: Setup Rust
+      uses: hecrj/setup-rust-action@v1
+      with:
+        rust-version: ${{ matrix.rust }}
+    - name: Checkout
+      uses: actions/checkout@v1
+    - name: Run benchmark
+      run: cargo +nightly test | tee output.txt
+    - name: Fetch gh-pages for avoiding conflict
+      run: git fetch 'https://dalance:${{ secrets.GITHUB_TOKEN }}@github.com/dalance/sv-parser.git' gh-pages:gh-pages
+    - name: Store benchmark result
+      uses: rhysd/github-action-benchmark@v1
+      with:
+        name: Rust Benchmark
+        tool: 'cargo'
+        output-file-path: output.txt
+    - name: Push benchmark result
+      run: git push 'https://dalance:${{ secrets.GITHUB_TOKEN }}@github.com/dalance/sv-parser.git' gh-pages:gh-pages
diff --git a/.github/workflows/periodic.yml b/.github/workflows/periodic.yml
new file mode 100644
index 0000000..b29bc57
--- /dev/null
+++ b/.github/workflows/periodic.yml
@@ -0,0 +1,25 @@
+name: Periodic
+
+on:
+  schedule:
+  - cron: 0 0 * * SUN
+
+jobs:
+  build:
+
+    strategy:
+      matrix:
+        os: [ubuntu-latest]
+        rust: [stable, beta, nightly]
+
+    runs-on: ${{ matrix.os }}
+
+    steps:
+    - name: Setup Rust
+      uses: hecrj/setup-rust-action@v1
+      with:
+        rust-version: ${{ matrix.rust }}
+    - name: Checkout
+      uses: actions/checkout@v1
+    - name: Run tests
+      run: cargo test
diff --git a/.github/workflows/regression.yml b/.github/workflows/regression.yml
new file mode 100644
index 0000000..bab0a05
--- /dev/null
+++ b/.github/workflows/regression.yml
@@ -0,0 +1,23 @@
+name: Regression
+
+on: [push, pull_request]
+
+jobs:
+  build:
+
+    strategy:
+      matrix:
+        os: [ubuntu-latest]
+        rust: [stable]
+
+    runs-on: ${{ matrix.os }}
+
+    steps:
+    - name: Setup Rust
+      uses: hecrj/setup-rust-action@v1
+      with:
+        rust-version: ${{ matrix.rust }}
+    - name: Checkout
+      uses: actions/checkout@v1
+    - name: Run tests
+      run: cargo test
diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
deleted file mode 100644
index 8911fcd..0000000
--- a/.github/workflows/test.yml
+++ /dev/null
@@ -1,13 +0,0 @@
-name: Test
-
-on: [push]
-
-jobs:
-  build:
-
-    runs-on: ubuntu-latest
-
-    steps:
-    - uses: actions/checkout@v1
-    - name: Run tests
-      run: cargo test --verbose
diff --git a/sv-parser-syntaxtree/src/general/identifiers.rs b/sv-parser-syntaxtree/src/general/identifiers.rs
index 8ef315a..d6c1506 100644
--- a/sv-parser-syntaxtree/src/general/identifiers.rs
+++ b/sv-parser-syntaxtree/src/general/identifiers.rs
@@ -349,7 +349,7 @@ pub struct PsOrHierarchicalNetIdentifierPackageScope {
 
 #[derive(Clone, Debug, PartialEq, Node)]
 pub struct PsOrHierarchicalNetIdentifierHierarchical {
-    pub nodes: (HierarchicalNetIdentifier),
+    pub nodes: (HierarchicalNetIdentifier,),
 }
 
 #[derive(Clone, Debug, PartialEq, Node)]
@@ -365,7 +365,7 @@ pub struct PsOrHierarchicalPropertyIdentifierPackageScope {
 
 #[derive(Clone, Debug, PartialEq, Node)]
 pub struct PsOrHierarchicalPropertyIdentifierHierarchical {
-    pub nodes: (HierarchicalPropertyIdentifier),
+    pub nodes: (HierarchicalPropertyIdentifier,),
 }
 
 #[derive(Clone, Debug, PartialEq, Node)]
@@ -381,7 +381,7 @@ pub struct PsOrHierarchicalSequenceIdentifierPackageScope {
 
 #[derive(Clone, Debug, PartialEq, Node)]
 pub struct PsOrHierarchicalSequenceIdentifierHierarchical {
-    pub nodes: (HierarchicalSequenceIdentifier),
+    pub nodes: (HierarchicalSequenceIdentifier,),
 }
 
 #[derive(Clone, Debug, PartialEq, Node)]
@@ -400,7 +400,7 @@ pub struct PsOrHierarchicalTfIdentifierPackageScope {
 
 #[derive(Clone, Debug, PartialEq, Node)]
 pub struct PsOrHierarchicalTfIdentifierHierarchical {
-    pub nodes: (HierarchicalTfIdentifier),
+    pub nodes: (HierarchicalTfIdentifier,),
 }
 
 #[derive(Clone, Debug, PartialEq, Node)]
diff --git a/sv-parser/Cargo.toml b/sv-parser/Cargo.toml
index ea1923e..26b90d3 100644
--- a/sv-parser/Cargo.toml
+++ b/sv-parser/Cargo.toml
@@ -35,5 +35,5 @@ structopt = "0.3.2"
 criterion = "0.3"
 
 [[bench]]
-name = "parse_sv"
+name = "parse_sv_criterion"
 harness = false
diff --git a/sv-parser/benches/parse_sv_bench.rs b/sv-parser/benches/parse_sv_bench.rs
new file mode 100644
index 0000000..f237d66
--- /dev/null
+++ b/sv-parser/benches/parse_sv_bench.rs
@@ -0,0 +1,37 @@
+#![feature(test)]
+
+extern crate test;
+
+use std::collections::HashMap;
+use std::env;
+use std::path::PathBuf;
+use sv_parser::parse_sv;
+use test::Bencher;
+
+fn get_path(s: &str) -> PathBuf {
+    PathBuf::from(format!(
+        "{}/testcases/{}",
+        env::var("CARGO_MANIFEST_DIR").unwrap(),
+        s
+    ))
+}
+
+#[bench]
+fn test1(b: &mut Bencher) {
+    let defines = HashMap::new();
+    let includes: Vec<PathBuf> = Vec::new();
+    let path = get_path("test1.sv");
+    b.iter(|| {
+        let _ = parse_sv(&path, &defines, &includes);
+    });
+}
+
+#[bench]
+fn test2(b: &mut Bencher) {
+    let defines = HashMap::new();
+    let includes: Vec<PathBuf> = Vec::new();
+    let path = get_path("test2.sv");
+    b.iter(|| {
+        let _ = parse_sv(&path, &defines, &includes);
+    });
+}
diff --git a/sv-parser/benches/parse_sv.rs b/sv-parser/benches/parse_sv_criterion.rs
similarity index 100%
rename from sv-parser/benches/parse_sv.rs
rename to sv-parser/benches/parse_sv_criterion.rs