From bf334c2e452b23c5c5e5f1ebba7b63ed8d218652 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Esteban=20K=C3=BCber?= <esteban@kuber.com.ar>
Date: Fri, 28 Feb 2025 00:30:45 +0000
Subject: [PATCH] Make trimming logic work on more than one span at a time

---
 compiler/rustc_errors/src/emitter.rs          | 37 +++++++++++++------
 .../ui/diagnostic-width/long-span.long.stderr | 19 +++++++---
 .../diagnostic-width/long-span.longest.stderr | 19 +++++++---
 tests/ui/diagnostic-width/long-span.rs        |  4 +-
 .../diagnostic-width/long-span.short.stderr   | 15 ++++++--
 .../long-span.shortest.stderr                 | 15 ++++++--
 6 files changed, 80 insertions(+), 29 deletions(-)

diff --git a/compiler/rustc_errors/src/emitter.rs b/compiler/rustc_errors/src/emitter.rs
index 2db3c2b00ab8c..21255fcca9617 100644
--- a/compiler/rustc_errors/src/emitter.rs
+++ b/compiler/rustc_errors/src/emitter.rs
@@ -882,11 +882,16 @@ impl HumanEmitter {
         //      |      x_span
         //      <EMPTY LINE>
         //
+        let mut overlap = vec![false; annotations.len()];
         let mut annotations_position = vec![];
         let mut line_len: usize = 0;
         let mut p = 0;
         for (i, annotation) in annotations.iter().enumerate() {
             for (j, next) in annotations.iter().enumerate() {
+                if overlaps(next, annotation, 0) && j > i {
+                    overlap[i] = true;
+                    overlap[j] = true;
+                }
                 if overlaps(next, annotation, 0)  // This label overlaps with another one and both
                     && annotation.has_label()     // take space (they have text and are not
                     && j > i                      // multiline lines).
@@ -1269,13 +1274,17 @@ impl HumanEmitter {
         // We look for individual *long* spans, and we trim the *middle*, so that we render
         // LL | ...= [0, 0, 0, ..., 0, 0];
         //    |      ^^^^^^^^^^...^^^^^^^ expected `&[u8]`, found `[{integer}; 1680]`
-        for &(pos, annotation) in &annotations_position {
+        for (i, (_pos, annotation)) in annotations_position.iter().enumerate() {
+            // Skip cases where multiple spans overlap each other.
+            if overlap[i] {
+                continue;
+            };
             let AnnotationType::Singleline = annotation.annotation_type else { continue };
             let width = annotation.end_col.display - annotation.start_col.display;
-            if pos == 0 && width > margin.column_width && width > 10 {
+            if width > margin.column_width * 2 && width > 10 {
                 // If the terminal is *too* small, we keep at least a tiny bit of the span for
                 // display.
-                let pad = max(margin.column_width / 2, 5);
+                let pad = max(margin.column_width / 3, 5);
                 // Code line
                 buffer.replace(
                     line_offset,
@@ -1800,15 +1809,7 @@ impl HumanEmitter {
                     width_offset + annotated_file.multiline_depth + 1
                 };
 
-                let column_width = if let Some(width) = self.diagnostic_width {
-                    width.saturating_sub(code_offset)
-                } else if self.ui_testing || cfg!(miri) {
-                    DEFAULT_COLUMN_WIDTH
-                } else {
-                    termize::dimensions()
-                        .map(|(w, _)| w.saturating_sub(code_offset))
-                        .unwrap_or(DEFAULT_COLUMN_WIDTH)
-                };
+                let column_width = self.column_width(code_offset);
 
                 let margin = Margin::new(
                     whitespace_margin,
@@ -1965,6 +1966,18 @@ impl HumanEmitter {
         Ok(())
     }
 
+    fn column_width(&self, code_offset: usize) -> usize {
+        if let Some(width) = self.diagnostic_width {
+            width.saturating_sub(code_offset)
+        } else if self.ui_testing || cfg!(miri) {
+            DEFAULT_COLUMN_WIDTH
+        } else {
+            termize::dimensions()
+                .map(|(w, _)| w.saturating_sub(code_offset))
+                .unwrap_or(DEFAULT_COLUMN_WIDTH)
+        }
+    }
+
     fn emit_suggestion_default(
         &mut self,
         span: &MultiSpan,
diff --git a/tests/ui/diagnostic-width/long-span.long.stderr b/tests/ui/diagnostic-width/long-span.long.stderr
index e39f4000d3cdc..252b17912dee2 100644
--- a/tests/ui/diagnostic-width/long-span.long.stderr
+++ b/tests/ui/diagnostic-width/long-span.long.stderr
@@ -1,9 +1,18 @@
+error[E0369]: cannot add `[{integer}; 1680]` to `[{integer}; 1680]`
+   ╭▸ $DIR/long-span.rs:7:5056
+   │
+LL │ …u8 = [0, 0, 0, 0, 0, 0, 0, 0, 0, …, 0, 0, 0, 0, 0, 0, 0] + [0, 0, 0, 0, 0, 0, 0, 0, 0, …, 0, 0, 0, 0, 0, 0, 0];
+   │       ┬───────────────────────────…────────────────────── ━ ────────────────────────────…────────────────────── [{integer}; 1680]
+   │       │
+   ╰╴      [{integer}; 1680]
+
 error[E0308]: mismatched types
-   ╭▸ $DIR/long-span.rs:7:15
+   ╭▸ $DIR/long-span.rs:9:15
    │
-LL │ …u8 = [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, …, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0];
-   ╰╴      ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━…━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ expected `u8`, found `[{integer}; 1680]`
+LL │ …u8 = [0, 0, 0, 0, 0, 0, 0, 0, 0, …, 0, 0, 0, 0, 0, 0, 0];
+   ╰╴      ━━━━━━━━━━━━━━━━━━━━━━━━━━━━…━━━━━━━━━━━━━━━━━━━━━━ expected `u8`, found `[{integer}; 1680]`
 
-error: aborting due to 1 previous error
+error: aborting due to 2 previous errors
 
-For more information about this error, try `rustc --explain E0308`.
+Some errors have detailed explanations: E0308, E0369.
+For more information about an error, try `rustc --explain E0308`.
diff --git a/tests/ui/diagnostic-width/long-span.longest.stderr b/tests/ui/diagnostic-width/long-span.longest.stderr
index 8e2bad93692de..2e77c36892231 100644
--- a/tests/ui/diagnostic-width/long-span.longest.stderr
+++ b/tests/ui/diagnostic-width/long-span.longest.stderr
@@ -1,9 +1,18 @@
+error[E0369]: cannot add `[{integer}; 1680]` to `[{integer}; 1680]`
+  --> $DIR/long-span.rs:7:5056
+   |
+LL | ... = [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0...0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0] + [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0...0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0];
+   |       -----------------------------------------...----------------------------------- ^ -----------------------------------------...----------------------------------- [{integer}; 1680]
+   |       |
+   |       [{integer}; 1680]
+
 error[E0308]: mismatched types
-  --> $DIR/long-span.rs:7:15
+  --> $DIR/long-span.rs:9:15
    |
-LL | ... = [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,... 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0];
-   |       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^...^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ expected `u8`, found `[{integer}; 1680]`
+LL | ... = [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0...0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0];
+   |       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^...^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ expected `u8`, found `[{integer}; 1680]`
 
-error: aborting due to 1 previous error
+error: aborting due to 2 previous errors
 
-For more information about this error, try `rustc --explain E0308`.
+Some errors have detailed explanations: E0308, E0369.
+For more information about an error, try `rustc --explain E0308`.
diff --git a/tests/ui/diagnostic-width/long-span.rs b/tests/ui/diagnostic-width/long-span.rs
index 2feacdd96047a..a3103379e93fd 100644
--- a/tests/ui/diagnostic-width/long-span.rs
+++ b/tests/ui/diagnostic-width/long-span.rs
@@ -4,6 +4,8 @@
 //@[long] compile-flags: --diagnostic-width=80 -Zunstable-options --json=diagnostic-unicode
 //@[longest] compile-flags: --diagnostic-width=120
 // ignore-tidy-linelength
-const C: u8 = [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0];
+const C: u8 = [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 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+//~^ ERROR E0369
+const D: u8 = [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0];
 //~^ ERROR E0308
 fn main() {}
diff --git a/tests/ui/diagnostic-width/long-span.short.stderr b/tests/ui/diagnostic-width/long-span.short.stderr
index 73ee895a89b63..b4803e31aaab8 100644
--- a/tests/ui/diagnostic-width/long-span.short.stderr
+++ b/tests/ui/diagnostic-width/long-span.short.stderr
@@ -1,9 +1,18 @@
+error[E0369]: cannot add `[{integer}; 1680]` to `[{integer}; 1680]`
+   ╭▸ $DIR/long-span.rs:7:5056
+   │
+LL │ …u8 = [0, 0, 0…0] + [0, 0, 0…0];
+   │       ┬───────…── ━ ────────…── [{integer}; 1680]
+   │       │
+   ╰╴      [{integer}; 1680]
+
 error[E0308]: mismatched types
-   ╭▸ $DIR/long-span.rs:7:15
+   ╭▸ $DIR/long-span.rs:9:15
    │
 LL │ …u8 = [0, 0, 0…0];
    ╰╴      ━━━━━━━━…━━ expected `u8`, found `[{integer}; 1680]`
 
-error: aborting due to 1 previous error
+error: aborting due to 2 previous errors
 
-For more information about this error, try `rustc --explain E0308`.
+Some errors have detailed explanations: E0308, E0369.
+For more information about an error, try `rustc --explain E0308`.
diff --git a/tests/ui/diagnostic-width/long-span.shortest.stderr b/tests/ui/diagnostic-width/long-span.shortest.stderr
index 2b485e7554135..1de1a4acd9291 100644
--- a/tests/ui/diagnostic-width/long-span.shortest.stderr
+++ b/tests/ui/diagnostic-width/long-span.shortest.stderr
@@ -1,9 +1,18 @@
+error[E0369]: cannot add `[{integer}; 1680]` to `[{integer}; 1680]`
+  --> $DIR/long-span.rs:7:5056
+   |
+LL | ... = [0, 0, 0...0] + [0, 0, 0...0];
+   |       --------...-- ^ --------...-- [{integer}; 1680]
+   |       |
+   |       [{integer}; 1680]
+
 error[E0308]: mismatched types
-  --> $DIR/long-span.rs:7:15
+  --> $DIR/long-span.rs:9:15
    |
 LL | ... = [0, 0, 0...0];
    |       ^^^^^^^^...^^ expected `u8`, found `[{integer}; 1680]`
 
-error: aborting due to 1 previous error
+error: aborting due to 2 previous errors
 
-For more information about this error, try `rustc --explain E0308`.
+Some errors have detailed explanations: E0308, E0369.
+For more information about an error, try `rustc --explain E0308`.