Rust: fix lexing of "break" and "continue"

fixes #1843
pygments · Jun 20, 2021 · 1664557 · 1664557
1 parent faf69c0
commit 1664557
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diff --git a/CHANGES b/CHANGES
@@ -12,6 +12,7 @@ Version 2.10.0
 (not released yet)
 
 - Fix assert statements in TNT lexer.
+- Rust: fix lexing of "break" and "continue" (#1843)
 
 
 Version 2.9.0

diff --git a/pygments/lexers/rust.py b/pygments/lexers/rust.py
@@ -109,7 +109,7 @@ class RustLexer(RegexLexer):
             # Types in positions.
             (r'(?::|->)', Text, 'typename'),
             # Labels
-            (r'(break|continue)(\s*)(\'[A-Za-z_]\w*)?',
+            (r'(break|continue)(\b\s*)(\'[A-Za-z_]\w*)?',
              bygroups(Keyword, Text.Whitespace, Name.Label)),
 
             # Character literals

diff --git a/tests/snippets/rust/test_break.txt b/tests/snippets/rust/test_break.txt
@@ -0,0 +1,39 @@
+---input---
+loop {
+    break;
+    break 'foo;
+    break'foo;
+    break_it;
+}
+
+---tokens---
+'loop'        Keyword
+' '           Text.Whitespace
+'{'           Punctuation
+'\n'          Text.Whitespace
+
+'    '        Text.Whitespace
+'break'       Keyword
+';'           Punctuation
+'\n'          Text.Whitespace
+
+'    '        Text.Whitespace
+'break'       Keyword
+' '           Text.Whitespace
+"'foo"        Name.Label
+';'           Punctuation
+'\n'          Text.Whitespace
+
+'    '        Text.Whitespace
+'break'       Keyword
+"'foo"        Name.Label
+';'           Punctuation
+'\n'          Text.Whitespace
+
+'    '        Text.Whitespace
+'break_it'    Name
+';'           Punctuation
+'\n'          Text.Whitespace
+
+'}'           Punctuation
+'\n'          Text.Whitespace