From 826dc600e8458a2a65c712492c48ec30a19fce2c Mon Sep 17 00:00:00 2001
From: Amr Hesham <amr96@programmer.net>
Date: Thu, 2 Mar 2023 21:24:29 +0200
Subject: Add support for impl and constraint declaration in Carbon lexer
 (#2368)

---
 pygments/lexers/carbon.py                          |  2 +-
 tests/examplefiles/carbon/declarations.carbon      |  9 ++++-
 .../examplefiles/carbon/declarations.carbon.output | 44 ++++++++++++++++++++++
 3 files changed, 53 insertions(+), 2 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',
diff --git a/tests/examplefiles/carbon/declarations.carbon b/tests/examplefiles/carbon/declarations.carbon
index 4f61d307..bcb9e05b 100644
--- a/tests/examplefiles/carbon/declarations.carbon
+++ b/tests/examplefiles/carbon/declarations.carbon
@@ -27,4 +27,11 @@ class Pal {
 
 abstract class MyAbstractClass {
   protected fn Create() -> partial Self { }
-}
\ No newline at end of file
+}
+
+constraint DrawVectorLegoFish {
+  impl as VectorLegoFish;
+  impl as Drawable;
+}
+
+impl JustX as X {}
\ No newline at end of file
diff --git a/tests/examplefiles/carbon/declarations.carbon.output b/tests/examplefiles/carbon/declarations.carbon.output
index b1db4d97..48b1362f 100644
--- a/tests/examplefiles/carbon/declarations.carbon.output
+++ b/tests/examplefiles/carbon/declarations.carbon.output
@@ -242,3 +242,47 @@
 
 '}'           Punctuation
 '\n'          Text.Whitespace
+
+'\n'          Text.Whitespace
+
+'constraint'  Keyword.Declaration
+' '           Text.Whitespace
+'DrawVectorLegoFish' Name.Other
+' '           Text.Whitespace
+'{'           Punctuation
+'\n'          Text.Whitespace
+
+'  '          Text.Whitespace
+'impl'        Keyword.Declaration
+' '           Text.Whitespace
+'as'          Keyword
+' '           Text.Whitespace
+'VectorLegoFish' Name.Other
+';'           Punctuation
+'\n'          Text.Whitespace
+
+'  '          Text.Whitespace
+'impl'        Keyword.Declaration
+' '           Text.Whitespace
+'as'          Keyword
+' '           Text.Whitespace
+'Drawable'    Name.Other
+';'           Punctuation
+'\n'          Text.Whitespace
+
+'}'           Punctuation
+'\n'          Text.Whitespace
+
+'\n'          Text.Whitespace
+
+'impl'        Keyword.Declaration
+' '           Text.Whitespace
+'JustX'       Name.Other
+' '           Text.Whitespace
+'as'          Keyword
+' '           Text.Whitespace
+'X'           Name.Other
+' '           Text.Whitespace
+'{'           Punctuation
+'}'           Punctuation
+'\n'          Text.Whitespace
-- 
cgit v1.2.1