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-rw-r--r--pygments/lexers/carbon.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/pygments/lexers/carbon.py b/pygments/lexers/carbon.py
index bb1cb36d..07cf75dd 100644
--- a/pygments/lexers/carbon.py
+++ b/pygments/lexers/carbon.py
@@ -41,7 +41,7 @@ class CarbonLexer(RegexLexer):
# Declaration
(r'(package|import|api|namespace|library)\b', Keyword.Namespace),
(r'(abstract|alias|fn|class|interface|let|var|virtual|external|'
- r'base|addr|extends|choice)\b', Keyword.Declaration),
+ r'base|addr|extends|choice|constraint|impl)\b', Keyword.Declaration),
# Keywords
(words(('as', 'or', 'not', 'and', 'break', 'continue', 'case',
'default', 'if', 'else', 'destructor', 'for', 'forall',