Implement From<&'a &'static str> for Arguments<'a>

Author: EFanZh

library/core/src/fmt/mod.rs

@@ -10,6 +10,7 @@ use crate::mem;
 use crate::num::fmt as numfmt;
 use crate::ops::Deref;
 use crate::result;
+use crate::slice;
 use crate::str;
 
 mod builders;
@@ -422,6 +423,14 @@ impl Display for Arguments<'_> {
     }
 }
 
+#[stable(feature = "rust1", since = "1.0.0")]
+impl<'a> From<&'a &'static str> for Arguments<'a> {
+    #[inline]
+    fn from(value: &'a &'static str) -> Self {
+        Self::new_const(slice::from_ref(value))
+    }
+}
+
 /// `?` formatting.
 ///
 /// `Debug` should format the output in a programmer-facing, debugging context.

library/core/tests/fmt/mod.rs

@@ -11,6 +11,13 @@ fn test_format_flags() {
     assert_eq!(format!("{: >3}", 'a'), "  a");
 }
 
+#[test]
+fn test_arguments_from_str() {
+    assert_eq!(core::fmt::Arguments::from(&"a string literal").to_string(), "a string literal");
+
+    assert_eq!(core::fmt::Arguments::from(&"a string literal").as_str(), Some("a string literal"));
+}
+
 #[test]
 fn test_pointer_formats_data_pointer() {
     let b: &[u8] = b"";