fn wants_box(x: @str) { }
fn wants_uniq(x: ~str) { }
fn wants_slice(x: &str) { }

fn has_box(x: @str) {
   wants_box(x);
   wants_uniq(x); //~ ERROR str storage differs: expected ~ but found @
   wants_slice(x);
}

fn has_uniq(x: ~str) {
   wants_box(x); //~ ERROR str storage differs: expected @ but found ~
   wants_uniq(x);
   wants_slice(x);
}

fn has_slice(x: &str) {
   wants_box(x); //~ ERROR str storage differs: expected @ but found &
   wants_uniq(x); //~ ERROR str storage differs: expected ~ but found &
   wants_slice(x);
}

fn main() {
}

fn wants_box(x: @str) { }
fn wants_uniq(x: ~str) { }
fn wants_three(x: str/3) { }

fn has_box(x: @str) {
   wants_box(x);
   wants_uniq(x); //~ ERROR str storage differs: expected ~ but found @
   wants_three(x); //~ ERROR str storage differs: expected 3 but found @
}

fn has_uniq(x: ~str) {
   wants_box(x); //~ ERROR str storage differs: expected @ but found ~
   wants_uniq(x);
   wants_three(x); //~ ERROR str storage differs: expected 3 but found ~
}

fn has_three(x: str/3) {
   wants_box(x); //~ ERROR str storage differs: expected @ but found 3
   wants_uniq(x); //~ ERROR str storage differs: expected ~ but found 3
   wants_three(x);
}

fn has_four(x: str/4) {
   wants_box(x); //~ ERROR str storage differs: expected @ but found 4
   wants_uniq(x); //~ ERROR str storage differs: expected ~ but found 4
   wants_three(x); //~ ERROR str storage differs: expected 3 but found 4
}

fn main() {
}

--- 
+++ 
@@ -1,29 +1,23 @@
 fn wants_box(x: @str) { }
 fn wants_uniq(x: ~str) { }
-fn wants_three(x: str/3) { }
+fn wants_slice(x: &str) { }
 
 fn has_box(x: @str) {
    wants_box(x);
    wants_uniq(x); //~ ERROR str storage differs: expected ~ but found @
-   wants_three(x); //~ ERROR str storage differs: expected 3 but found @
+   wants_slice(x);
 }
 
 fn has_uniq(x: ~str) {
    wants_box(x); //~ ERROR str storage differs: expected @ but found ~
    wants_uniq(x);
-   wants_three(x); //~ ERROR str storage differs: expected 3 but found ~
+   wants_slice(x);
 }
 
-fn has_three(x: str/3) {
-   wants_box(x); //~ ERROR str storage differs: expected @ but found 3
-   wants_uniq(x); //~ ERROR str storage differs: expected ~ but found 3
-   wants_three(x);
-}
-
-fn has_four(x: str/4) {
-   wants_box(x); //~ ERROR str storage differs: expected @ but found 4
-   wants_uniq(x); //~ ERROR str storage differs: expected ~ but found 4
-   wants_three(x); //~ ERROR str storage differs: expected 3 but found 4
+fn has_slice(x: &str) {
+   wants_box(x); //~ ERROR str storage differs: expected @ but found &
+   wants_uniq(x); //~ ERROR str storage differs: expected ~ but found &
+   wants_slice(x);
 }
 
 fn main() {
Remove obsolete fixed-length string test
