Sort FxHashSet's contents before emitting errors for consistent output

Author: estebank

compiler/rustc_interface/src/passes.rs

@@ -452,7 +452,10 @@ pub fn configure_and_expand(
 
     // Gate identifiers containing invalid Unicode codepoints that were recovered during lexing.
     sess.parse_sess.bad_unicode_identifiers.with_lock(|identifiers| {
-        for (ident, spans) in identifiers.drain() {
+        let mut identifiers: Vec<_> = identifiers.drain().collect();
+        identifiers.sort_by_key(|&(key, _)| key);
+        for (ident, mut spans) in identifiers.into_iter() {
+            spans.sort();
             sess.diagnostic().span_err(
                 MultiSpan::from(spans),
                 &format!("identifiers cannot contain emoji: `{}`", ident),

src/test/ui/parser/emoji-identifiers.stderr

@@ -18,23 +18,11 @@ LL | fn i_like_to_😅_a_lot() -> 👀 {
 LL |     let _ = i_like_to_😄_a_lot() ➖ 4;
    |             ^^^^^^^^^^^^^^^^^^ help: a function with a similar name exists: `i_like_to_😅_a_lot`
 
-error: identifiers cannot contain emoji: `i_like_to_😄_a_lot`
-  --> $DIR/emoji-identifiers.rs:13:13
-   |
-LL |     let _ = i_like_to_😄_a_lot() ➖ 4;
-   |             ^^^^^^^^^^^^^^^^^^
-
-error: identifiers cannot contain emoji: `full_of_✨`
-  --> $DIR/emoji-identifiers.rs:4:8
-   |
-LL |     fn full_of_✨() -> 👀 {
-   |        ^^^^^^^^^^
-
-error: identifiers cannot contain emoji: `full_of✨`
-  --> $DIR/emoji-identifiers.rs:9:8
+error: identifiers cannot contain emoji: `ABig👩👩👧👧Family`
+  --> $DIR/emoji-identifiers.rs:1:8
    |
-LL |     👀::full_of✨()
-   |         ^^^^^^^^^
+LL | struct ABig👩👩👧👧Family;
+   |        ^^^^^^^^^^^^^^^^^^
 
 error: identifiers cannot contain emoji: `👀`
   --> $DIR/emoji-identifiers.rs:2:8
@@ -53,17 +41,29 @@ LL | fn i_like_to_😅_a_lot() -> 👀 {
 LL |     👀::full_of✨()
    |     ^^
 
+error: identifiers cannot contain emoji: `full_of_✨`
+  --> $DIR/emoji-identifiers.rs:4:8
+   |
+LL |     fn full_of_✨() -> 👀 {
+   |        ^^^^^^^^^^
+
 error: identifiers cannot contain emoji: `i_like_to_😅_a_lot`
   --> $DIR/emoji-identifiers.rs:8:4
    |
 LL | fn i_like_to_😅_a_lot() -> 👀 {
    |    ^^^^^^^^^^^^^^^^^^
 
-error: identifiers cannot contain emoji: `ABig👩👩👧👧Family`
-  --> $DIR/emoji-identifiers.rs:1:8
+error: identifiers cannot contain emoji: `full_of✨`
+  --> $DIR/emoji-identifiers.rs:9:8
    |
-LL | struct ABig👩👩👧👧Family;
-   |        ^^^^^^^^^^^^^^^^^^
+LL |     👀::full_of✨()
+   |         ^^^^^^^^^
+
+error: identifiers cannot contain emoji: `i_like_to_😄_a_lot`
+  --> $DIR/emoji-identifiers.rs:13:13
+   |
+LL |     let _ = i_like_to_😄_a_lot() ➖ 4;
+   |             ^^^^^^^^^^^^^^^^^^
 
 error[E0599]: no function or associated item named `full_of✨` found for struct `👀` in the current scope
   --> $DIR/emoji-identifiers.rs:9:8