From 439b7661616ec26092176baf905a0ceeb4a3c620 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Aur=C3=A9lien=20Deharbe?= <aurelien.deharbe@ssi.gouv.fr>
Date: Fri, 11 Sep 2020 11:11:11 +0200
Subject: [PATCH] replacing sub's that can wrap by saturating_sub's

---
 compiler/rustc_errors/src/emitter.rs | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/compiler/rustc_errors/src/emitter.rs b/compiler/rustc_errors/src/emitter.rs
index 5a654e83aed8e..4555168af0ab5 100644
--- a/compiler/rustc_errors/src/emitter.rs
+++ b/compiler/rustc_errors/src/emitter.rs
@@ -959,15 +959,15 @@ impl EmitterWriter {
                         '_',
                         line_offset + pos,
                         width_offset + depth,
-                        code_offset + annotation.start_col - left,
+                        (code_offset + annotation.start_col).saturating_sub(left),
                         style,
                     );
                 }
                 _ if self.teach => {
                     buffer.set_style_range(
                         line_offset,
-                        code_offset + annotation.start_col - left,
-                        code_offset + annotation.end_col - left,
+                        (code_offset + annotation.start_col).saturating_sub(left),
+                        (code_offset + annotation.end_col).saturating_sub(left),
                         style,
                         annotation.is_primary,
                     );