diff --git a/Cargo.toml b/Cargo.toml
index 68ab918df..16df7e16f 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -4,27 +4,31 @@ name = "maturin"
 version = "1.4.0"
 description = "Build and publish crates with pyo3, rust-cpython and cffi bindings as well as rust binaries as python packages"
 exclude = [
-  "test-crates/**/*",
-  "sysconfig/*",
-  "test-data/*",
-  "ci/*",
-  "tests/*",
-  "guide/*",
-  ".github/*",
-  ".devcontainer/*",
-  "Dockerfile",
-  ".dockerignore",
-  "deny.toml",
-  "noxfile.py",
-  "test-dockerfile.sh",
-  "Code-of-Conduct.md",
+    "test-crates/**/*",
+    "sysconfig/*",
+    "test-data/*",
+    "ci/*",
+    "tests/*",
+    "guide/*",
+    ".github/*",
+    ".devcontainer/*",
+    "Dockerfile",
+    ".dockerignore",
+    "deny.toml",
+    "noxfile.py",
+    "test-dockerfile.sh",
+    "Code-of-Conduct.md",
 ]
 homepage = "https://github.com/pyo3/maturin"
 readme = "README.md"
 repository = "https://github.com/pyo3/maturin"
 license = "MIT OR Apache-2.0"
 keywords = ["python", "cffi", "packaging", "pypi", "pyo3"]
-categories = ["api-bindings", "development-tools::ffi", "command-line-utilities"]
+categories = [
+    "api-bindings",
+    "development-tools::ffi",
+    "command-line-utilities",
+]
 edition = "2021"
 rust-version = "1.70"
 
@@ -53,7 +57,11 @@ tar = "0.4.38"
 tempfile = "3.2.0"
 toml = "0.8.8"
 toml_edit = "0.21.0"
-zip = { version = "0.6.1", default-features = false, features = ["bzip2", "deflate", "time"] }
+zip = { version = "0.6.1", default-features = false, features = [
+    "bzip2",
+    "deflate",
+    "time",
+] }
 thiserror = "1.0.37"
 fs-err = "2.11.0"
 fat-macho = { version = "0.4.8", default-features = false }
@@ -75,10 +83,15 @@ path-slash = "0.2.1"
 pep440_rs = { version = "0.5.0", features = ["serde", "tracing"] }
 pep508_rs = { version = "0.4.2", features = ["serde", "tracing"] }
 time = "0.3.17"
-unicode-xid = "0.2.4"
+unicode-xid = { version = "0.2.4", optional = true }
 
 # cli
-clap = { version = "4.0.0", features = ["derive", "env", "wrap_help", "unstable-styles"] }
+clap = { version = "4.0.0", features = [
+    "derive",
+    "env",
+    "wrap_help",
+    "unstable-styles",
+] }
 clap_complete_command = { version = "0.5.1", optional = true }
 
 # cross compile
@@ -87,7 +100,9 @@ cargo-xwin = { version = "0.16.4", default-features = false, optional = true }
 
 # log
 tracing = "0.1.36"
-tracing-subscriber = { version = "0.3.15", features = ["env-filter"], optional = true }
+tracing-subscriber = { version = "0.3.15", features = [
+    "env-filter",
+], optional = true }
 
 # project scaffolding, maturin new/init/generate-ci
 dialoguer = { version = "0.11.0", default-features = false, optional = true }
@@ -98,12 +113,20 @@ minijinja = { version = "1.0.7", optional = true }
 bytesize = { version = "1.0.1", optional = true }
 configparser = { version = "3.0.3", optional = true }
 dirs = { version = "5.0.0", optional = true }
-multipart = { version = "0.18.0", features = ["client"], default-features = false, optional = true }
-ureq = { version = "2.9.4", features = ["gzip", "json", "socks-proxy"], default-features = false, optional = true }
+multipart = { version = "0.18.0", features = [
+    "client",
+], default-features = false, optional = true }
+ureq = { version = "2.9.4", features = [
+    "gzip",
+    "json",
+    "socks-proxy",
+], default-features = false, optional = true }
 native-tls = { version = "0.2.8", optional = true }
 rustls = { version = "0.22.2", optional = true }
 rustls-pemfile = { version = "2.0.0", optional = true }
-keyring = { version = "2.0.0", default-features = false, features = ["linux-no-secret-service"], optional = true }
+keyring = { version = "2.0.0", default-features = false, features = [
+    "linux-no-secret-service",
+], optional = true }
 wild = { version = "2.1.0", optional = true }
 url = { version = "2.3.0", optional = true }
 
@@ -125,12 +148,31 @@ log = ["tracing-subscriber"]
 
 cli-completion = ["dep:clap_complete_command"]
 
-upload = ["ureq", "multipart", "configparser", "bytesize", "dialoguer/password", "url", "wild", "dep:dirs"]
+upload = [
+    "ureq",
+    "multipart",
+    "configparser",
+    "bytesize",
+    "dialoguer/password",
+    "url",
+    "wild",
+    "dep:dirs",
+]
 # keyring doesn't support *BSD so it's not enabled in `full` by default
 password-storage = ["upload", "keyring"]
 
-rustls = ["dep:rustls", "ureq?/tls", "cargo-xwin?/rustls-tls", "dep:rustls-pemfile"]
-native-tls = ["dep:native-tls", "ureq?/native-tls", "cargo-xwin?/native-tls", "dep:rustls-pemfile"]
+rustls = [
+    "dep:rustls",
+    "ureq?/tls",
+    "cargo-xwin?/rustls-tls",
+    "dep:rustls-pemfile",
+]
+native-tls = [
+    "dep:native-tls",
+    "ureq?/native-tls",
+    "cargo-xwin?/native-tls",
+    "dep:rustls-pemfile",
+]
 
 # cross compile using zig or xwin
 cross-compile = ["zig", "xwin"]
@@ -138,7 +180,7 @@ zig = ["cargo-zigbuild"]
 xwin = ["cargo-xwin"]
 
 # project scaffolding
-scaffolding = ["dialoguer", "console", "minijinja"]
+scaffolding = ["dialoguer", "console", "minijinja", "unicode-xid"]
 
 # Internal feature to speed up the tests significantly
 faster-tests = []
diff --git a/src/lib.rs b/src/lib.rs
index e6fcc644c..dc89994e1 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -55,7 +55,6 @@ mod metadata;
 mod module_writer;
 #[cfg(feature = "scaffolding")]
 mod new_project;
-mod package_name_validations;
 mod project_layout;
 pub mod pyproject_toml;
 mod python_interpreter;
diff --git a/src/new_project.rs b/src/new_project.rs
index 4ec938246..90683d663 100644
--- a/src/new_project.rs
+++ b/src/new_project.rs
@@ -1,5 +1,5 @@
+use self::package_name_validations::cargo_check_name;
 use crate::ci::GenerateCI;
-use crate::package_name_validations::cargo_check_name;
 use crate::BridgeModel;
 use anyhow::{bail, Context, Result};
 use console::style;
@@ -256,3 +256,123 @@ fn generate_project(
     let generator = ProjectGenerator::new(name, layout, bindings, overwrite)?;
     generator.generate(project_path)
 }
+
+mod package_name_validations {
+    // Based on: https://github.com/rust-lang/cargo/blob/e975158c1b542aa3833fd8584746538c17a6ae55/src/cargo/ops/cargo_new.rs#L169
+    pub fn cargo_check_name(name: &str) -> anyhow::Result<()> {
+        // Instead of `PackageName::new` which performs these checks in the original cargo code
+        validate_package_name(name)?;
+
+        if is_keyword(name) {
+            anyhow::bail!(
+                "the name `{}` cannot be used as a package name, it is a Rust keyword",
+                name,
+            );
+        }
+        if is_conflicting_artifact_name(name) {
+            anyhow::bail!(
+                "the name `{}` cannot be used as a package name, \
+                    it conflicts with cargo's build directory names",
+                name,
+            );
+        }
+        if name == "test" {
+            anyhow::bail!(
+                "the name `test` cannot be used as a package name, \
+                it conflicts with Rust's built-in test library",
+            );
+        }
+        if ["core", "std", "alloc", "proc_macro", "proc-macro"].contains(&name) {
+            eprintln!(
+                "⚠️  Warning: the name `{}` is part of Rust's standard library\n\
+                It is recommended to use a different name to avoid problems.",
+                name,
+            );
+        }
+        if is_windows_reserved(name) {
+            eprintln!(
+                "⚠️  Warning: the name `{}` is a reserved Windows filename\n\
+                This package will not work on Windows platforms.",
+                name
+            );
+        }
+        if is_non_ascii_name(name) {
+            eprintln!(
+                "⚠️  Warning: the name `{}` contains non-ASCII characters\n\
+                Non-ASCII crate names are not supported by Rust.",
+                name
+            );
+        }
+        let name_in_lowercase = name.to_lowercase();
+        if name != name_in_lowercase {
+            eprintln!(
+                "⚠️  Warning: the name `{name}` is not snake_case or kebab-case which is recommended for package names, consider `{name_in_lowercase}`"
+            );
+        }
+
+        Ok(())
+    }
+
+    // Based on: https://github.com/rust-lang/cargo/blob/7b7af3077bff8d60b7f124189bc9de227d3063a9/crates/cargo-util-schemas/src/restricted_names.rs#L42
+    fn validate_package_name(name: &str) -> anyhow::Result<()> {
+        if name.is_empty() {
+            anyhow::bail!("Package names cannot be empty");
+        }
+
+        let mut chars = name.chars();
+        if let Some(ch) = chars.next() {
+            if ch.is_ascii_digit() {
+                // A specific error for a potentially common case.
+                anyhow::bail!("Package names cannot start with a digit");
+            }
+            if !(unicode_xid::UnicodeXID::is_xid_start(ch) || ch == '_') {
+                anyhow::bail!(
+                    "the first character must be a Unicode XID start character (most letters or `_`)"
+                );
+            }
+        }
+        for ch in chars {
+            if !(unicode_xid::UnicodeXID::is_xid_continue(ch) || ch == '-') {
+                anyhow::bail!(
+                    "characters must be Unicode XID characters (numbers, `-`, `_`, or most letters)"
+                );
+            }
+        }
+        Ok(())
+    }
+
+    // The following functions are based on https://github.com/rust-lang/cargo/blob/e975158c1b542aa3833fd8584746538c17a6ae55/src/cargo/util/restricted_names.rs
+
+    /// Returns `true` if the name contains non-ASCII characters.
+    pub fn is_non_ascii_name(name: &str) -> bool {
+        name.chars().any(|ch| ch > '\x7f')
+    }
+
+    /// A Rust keyword.
+    pub fn is_keyword(name: &str) -> bool {
+        // See https://doc.rust-lang.org/reference/keywords.html
+        [
+            "Self", "abstract", "as", "async", "await", "become", "box", "break", "const",
+            "continue", "crate", "do", "dyn", "else", "enum", "extern", "false", "final", "fn",
+            "for", "if", "impl", "in", "let", "loop", "macro", "match", "mod", "move", "mut",
+            "override", "priv", "pub", "ref", "return", "self", "static", "struct", "super",
+            "trait", "true", "try", "type", "typeof", "unsafe", "unsized", "use", "virtual",
+            "where", "while", "yield",
+        ]
+        .contains(&name)
+    }
+
+    /// These names cannot be used on Windows, even with an extension.
+    pub fn is_windows_reserved(name: &str) -> bool {
+        [
+            "con", "prn", "aux", "nul", "com1", "com2", "com3", "com4", "com5", "com6", "com7",
+            "com8", "com9", "lpt1", "lpt2", "lpt3", "lpt4", "lpt5", "lpt6", "lpt7", "lpt8", "lpt9",
+        ]
+        .contains(&name.to_ascii_lowercase().as_str())
+    }
+
+    /// An artifact with this name will conflict with one of Cargo's build directories.
+    pub fn is_conflicting_artifact_name(name: &str) -> bool {
+        ["deps", "examples", "build", "incremental"].contains(&name)
+    }
+}
diff --git a/src/package_name_validations.rs b/src/package_name_validations.rs
deleted file mode 100644
index 05db1f0e1..000000000
--- a/src/package_name_validations.rs
+++ /dev/null
@@ -1,116 +0,0 @@
-// Based on: https://github.com/rust-lang/cargo/blob/e975158c1b542aa3833fd8584746538c17a6ae55/src/cargo/ops/cargo_new.rs#L169
-pub fn cargo_check_name(name: &str) -> anyhow::Result<()> {
-    // Instead of `PackageName::new` which performs these checks in the original cargo code
-    validate_package_name(name)?;
-
-    if is_keyword(name) {
-        anyhow::bail!(
-            "the name `{}` cannot be used as a package name, it is a Rust keyword",
-            name,
-        );
-    }
-    if is_conflicting_artifact_name(name) {
-        anyhow::bail!(
-            "the name `{}` cannot be used as a package name, \
-                it conflicts with cargo's build directory names",
-            name,
-        );
-    }
-    if name == "test" {
-        anyhow::bail!(
-            "the name `test` cannot be used as a package name, \
-            it conflicts with Rust's built-in test library",
-        );
-    }
-    if ["core", "std", "alloc", "proc_macro", "proc-macro"].contains(&name) {
-        eprintln!(
-            "⚠️  Warning: the name `{}` is part of Rust's standard library\n\
-            It is recommended to use a different name to avoid problems.",
-            name,
-        );
-    }
-    if is_windows_reserved(name) {
-        eprintln!(
-            "⚠️  Warning: the name `{}` is a reserved Windows filename\n\
-            This package will not work on Windows platforms.",
-            name
-        );
-    }
-    if is_non_ascii_name(name) {
-        eprintln!(
-            "⚠️  Warning: the name `{}` contains non-ASCII characters\n\
-            Non-ASCII crate names are not supported by Rust.",
-            name
-        );
-    }
-    let name_in_lowercase = name.to_lowercase();
-    if name != name_in_lowercase {
-        eprintln!(
-            "⚠️  Warning: the name `{name}` is not snake_case or kebab-case which is recommended for package names, consider `{name_in_lowercase}`"
-        );
-    }
-
-    Ok(())
-}
-
-// Based on: https://github.com/rust-lang/cargo/blob/7b7af3077bff8d60b7f124189bc9de227d3063a9/crates/cargo-util-schemas/src/restricted_names.rs#L42
-fn validate_package_name(name: &str) -> anyhow::Result<()> {
-    if name.is_empty() {
-        anyhow::bail!("Package names cannot be empty");
-    }
-
-    let mut chars = name.chars();
-    if let Some(ch) = chars.next() {
-        if ch.is_ascii_digit() {
-            // A specific error for a potentially common case.
-            anyhow::bail!("Package names cannot start with a digit");
-        }
-        if !(unicode_xid::UnicodeXID::is_xid_start(ch) || ch == '_') {
-            anyhow::bail!(
-                "the first character must be a Unicode XID start character (most letters or `_`)"
-            );
-        }
-    }
-    for ch in chars {
-        if !(unicode_xid::UnicodeXID::is_xid_continue(ch) || ch == '-') {
-            anyhow::bail!(
-                "characters must be Unicode XID characters (numbers, `-`, `_`, or most letters)"
-            );
-        }
-    }
-    Ok(())
-}
-
-// The following functions are based on https://github.com/rust-lang/cargo/blob/e975158c1b542aa3833fd8584746538c17a6ae55/src/cargo/util/restricted_names.rs
-
-/// Returns `true` if the name contains non-ASCII characters.
-pub fn is_non_ascii_name(name: &str) -> bool {
-    name.chars().any(|ch| ch > '\x7f')
-}
-
-/// A Rust keyword.
-pub fn is_keyword(name: &str) -> bool {
-    // See https://doc.rust-lang.org/reference/keywords.html
-    [
-        "Self", "abstract", "as", "async", "await", "become", "box", "break", "const", "continue",
-        "crate", "do", "dyn", "else", "enum", "extern", "false", "final", "fn", "for", "if",
-        "impl", "in", "let", "loop", "macro", "match", "mod", "move", "mut", "override", "priv",
-        "pub", "ref", "return", "self", "static", "struct", "super", "trait", "true", "try",
-        "type", "typeof", "unsafe", "unsized", "use", "virtual", "where", "while", "yield",
-    ]
-    .contains(&name)
-}
-
-/// These names cannot be used on Windows, even with an extension.
-pub fn is_windows_reserved(name: &str) -> bool {
-    [
-        "con", "prn", "aux", "nul", "com1", "com2", "com3", "com4", "com5", "com6", "com7", "com8",
-        "com9", "lpt1", "lpt2", "lpt3", "lpt4", "lpt5", "lpt6", "lpt7", "lpt8", "lpt9",
-    ]
-    .contains(&name.to_ascii_lowercase().as_str())
-}
-
-/// An artifact with this name will conflict with one of Cargo's build directories.
-pub fn is_conflicting_artifact_name(name: &str) -> bool {
-    ["deps", "examples", "build", "incremental"].contains(&name)
-}