[std::str] Rename from_utf8_owned_opt() to from_utf8_owned(), drop the old from_utf8_owned() behavior

src/test/bench/shootout-k-nucleotide.rs

@@ -59,7 +59,7 @@ impl Code {
         }
 
         reverse(result);
-        str::from_utf8_owned(result)
+        str::from_utf8_owned(result).unwrap()
     }
 }
 

src/test/bench/shootout-meteor.rs

@@ -187,7 +187,7 @@ fn to_utf8(raw_sol: &List<u64>) -> ~str {
             if m & 1 << i != 0 {sol[i] = '0' as u8 + id;}
         }
     }
-    std::str::from_utf8_owned(sol)
+    std::str::from_utf8_owned(sol).unwrap()
 }
 
 // Prints a solution in ~str form.

src/test/run-pass/core-run-destroy.rs

@@ -62,14 +62,14 @@ fn test_destroy_actually_kills(force: bool) {
     fn process_exists(pid: libc::pid_t) -> bool {
         let run::ProcessOutput {output, ..} = run::process_output("ps", [~"-p", pid.to_str()])
             .expect("failed to exec `ps`");
-        str::from_utf8_owned(output).contains(pid.to_str())
+        str::from_utf8_owned(output).unwrap().contains(pid.to_str())
     }
 
     #[cfg(unix,target_os="android")]
     fn process_exists(pid: libc::pid_t) -> bool {
         let run::ProcessOutput {output, ..} = run::process_output("/system/bin/ps", [pid.to_str()])
             .expect("failed to exec `/system/bin/ps`");
-        str::from_utf8_owned(output).contains(~"root")
+        str::from_utf8_owned(output).unwrap().contains(~"root")
     }
 
     #[cfg(windows)]

src/test/run-pass/ifmt.rs

@@ -260,7 +260,7 @@ fn test_write() {
         writeln!(w, "{foo}", foo="bar");
     }
 
-    let s = str::from_utf8_owned(buf.unwrap());
+    let s = str::from_utf8_owned(buf.unwrap()).unwrap();
     t!(s, "34helloline\nbar\n");
 }
 
@@ -284,7 +284,7 @@ fn test_format_args() {
         format_args!(|args| { fmt::write(w, args) }, "test");
         format_args!(|args| { fmt::write(w, args) }, "{test}", test=3);
     }
-    let s = str::from_utf8_owned(buf.unwrap());
+    let s = str::from_utf8_owned(buf.unwrap()).unwrap();
     t!(s, "1test3");
 
     let s = format_args!(fmt::format, "hello {}", "world");