Use str::from_utf8 instead

src/shims/mod.rs

@@ -1,4 +1,3 @@
-
 pub mod foreign_items;
 pub mod intrinsics;
 pub mod tls;

tests/run-pass/aligned_utf8_check.rs

@@ -6,7 +6,7 @@ fn main() {
     let mut y: Vec<u8> = unsafe { std::mem::transmute(x) };
     unsafe { y.set_len(2 * N) };
 
-    println!("{:?}", String::from_utf8_lossy(&y));
+    println!("{:?}", std::str::from_utf8(&y).unwrap());
 
     let mut x: Vec<u16> = unsafe { std::mem::transmute(y) };
     unsafe { x.set_len(N) };