manifest-schema: Improve quality as a library

tools/manifest-schema/Cargo.toml

@@ -2,16 +2,33 @@
 name = "install-action-manifest-schema"
 version = "0.1.0"
 edition = "2021"
-license = "MIT OR Apache-2.0"
+rust-version = "1.79" # Align to cargo-binstall: https://crates.io/crates/cargo-binstall
+license = "Apache-2.0 OR MIT"
+repository = "https://github.com/taiki-e/install-action"
+keywords = []
+categories = []
+description = """
+Structured access to the install-action manifests.
+"""
+
+[package.metadata.docs.rs]
+targets = ["x86_64-unknown-linux-gnu"]
+
+[package.metadata.cargo_check_external_types]
+# The following are external types that are allowed to be exposed in our public API.
+allowed_external_types = [
+    "semver::*",
+    "serde::*",
+]
+
+[lib]
+doc-scrape-examples = false
 
 # Note: semver and serde are public dependencies.
 [dependencies]
 semver = { version = "1", features = ["serde"] }
-serde = "1"
-serde_derive = "1"
+serde = "1.0.165"
+serde_derive = "1.0.165"
 
 [lints]
 workspace = true
-
-[package.metadata.cargo_check_external_types]
-allowed_external_types = ["semver::*", "serde::*"]

tools/manifest-schema/src/lib.rs

@@ -1,5 +1,28 @@
 // SPDX-License-Identifier: Apache-2.0 OR MIT
 
+/*!
+Structured access to the install-action manifests.
+*/
+
+#![doc(test(
+    no_crate_inject,
+    attr(
+        deny(warnings, rust_2018_idioms, single_use_lifetimes),
+        allow(dead_code, unused_variables)
+    )
+))]
+#![warn(
+    // Lints that may help when writing public library.
+    missing_debug_implementations,
+    // missing_docs,
+    clippy::alloc_instead_of_core,
+    // clippy::exhaustive_enums,
+    // clippy::exhaustive_structs,
+    clippy::impl_trait_in_params,
+    // clippy::missing_inline_in_public_items,
+    // clippy::std_instead_of_alloc,
+    // clippy::std_instead_of_core,
+)]
 #![allow(clippy::missing_panics_doc, clippy::too_long_first_doc_paragraph)]
 
 use std::{
@@ -303,7 +326,7 @@ impl StringOrArray {
         }
     }
     #[must_use]
-    pub fn map(&self, mut f: impl FnMut(&String) -> String) -> Self {
+    pub fn map<F: FnMut(&String) -> String>(&self, mut f: F) -> Self {
         match self {
             Self::String(s) => Self::String(f(s)),
             Self::Array(v) => Self::Array(v.iter().map(f).collect()),