Fix compilation errors under no_std

src/string.rs

@@ -26,9 +26,9 @@ use crate::dynamic::{DynamicVec, InlineVec};
 #[clippy::format_args]
 macro_rules! eco_format {
     ($($tts:tt)*) => {{
-        use ::std::fmt::Write;
+        use ::core::fmt::Write;
         let mut s = $crate::EcoString::new();
-        ::std::write!(s, $($tts)*).unwrap();
+        ::core::write!(s, $($tts)*).unwrap();
         s
     }};
 }

src/vendor/vec/splice.rs

@@ -5,6 +5,9 @@
 use core::ptr;
 use core::slice;
 
+#[cfg(not(feature = "std"))]
+use alloc::vec::Vec;
+
 use crate::EcoVec;
 
 use super::Drain;

tests/tests.rs

@@ -10,7 +10,7 @@ use std::mem;
 use std::sync::atomic::{AtomicUsize, Ordering::*};
 
 use ecow::string::ToEcoString;
-use ecow::{eco_vec, EcoString, EcoVec};
+use ecow::{eco_format, eco_vec, EcoString, EcoVec};
 
 const ALPH: &str = "abcdefghijklmnopqrstuvwxyz";
 const LIMIT: usize = EcoString::INLINE_LIMIT;
@@ -371,6 +371,14 @@ fn test_array_from_vec() {
     assert_eq!(<[String; 0]>::try_from(EcoVec::new()).unwrap(), <[String; 0]>::default());
 }
 
+#[test]
+fn test_str_macro() {
+    assert_eq!(
+        eco_format!("Hello, {}! The secret number is {}.", "world".to_owned(), 42),
+        "Hello, world! The secret number is 42."
+    );
+}
+
 #[test]
 fn test_str_new() {
     // Test inline strings.