feat: impl From<[(K, V); N]> for Map and Value

build.rs

@@ -32,6 +32,12 @@ fn main() {
         println!("cargo:rustc-cfg=no_btreemap_remove_entry");
     }
 
+    // Const generics
+    // https://blog.rust-lang.org/2021/03/25/Rust-1.51.0.html#const-generics-mvp
+    if minor < 51 {
+        println!("cargo:rustc-cfg=no_const_generics");
+    }
+
     // BTreeMap::retain
     // https://blog.rust-lang.org/2021/06/17/Rust-1.53.0.html#stabilized-apis
     if minor < 53 {

src/map.rs

@@ -430,6 +430,15 @@ impl<'de> de::Deserialize<'de> for Map<String, Value> {
     }
 }
 
+#[cfg(not(no_const_generics))]
+impl<const N: usize> From<[(String, Value); N]> for Map<String, Value> {
+    fn from(arr: [(String, Value); N]) -> Self {
+        // FromIterator::from_iter cannot be used before Rust 1.53
+        #[allow(deprecated)]
+        core::array::IntoIter::new(arr).collect()
+    }
+}
+
 impl FromIterator<(String, Value)> for Map<String, Value> {
     fn from_iter<T>(iter: T) -> Self
     where

src/value/from.rs

@@ -233,6 +233,25 @@ impl<T: Into<Value>> FromIterator<T> for Value {
     }
 }
 
+#[cfg(not(no_const_generics))]
+impl<K: Into<String>, V: Into<Value>, const N: usize> From<[(K, V); N]> for Value {
+    /// Convert a list of map entry tuples to `Value`
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// use serde_json::Value;
+    ///
+    /// let v = [("lorem", 40), ("ipsum", 2)];
+    /// let x: Value = v.into();
+    /// ```
+    fn from(arr: [(K, V); N]) -> Self {
+        // FromIterator::from_iter cannot be used before Rust 1.53
+        #[allow(deprecated)]
+        core::array::IntoIter::new(arr).collect()
+    }
+}
+
 impl<K: Into<String>, V: Into<Value>> FromIterator<(K, V)> for Value {
     /// Convert an iteratable type to a `Value`
     ///