From bf72f7d1097da908a3e96736e90466fb77a11670 Mon Sep 17 00:00:00 2001
From: Dennis Korpel <dkorpel@gmail.com>
Date: Thu, 13 Oct 2022 22:12:52 +0200
Subject: [PATCH] Fix 23410 - ImportC: binary constants not allowed

---
 compiler/src/dmd/lexer.d                    | 2 --
 compiler/test/fail_compilation/numliteral.c | 4 ++--
 2 files changed, 2 insertions(+), 4 deletions(-)

diff --git a/compiler/src/dmd/lexer.d b/compiler/src/dmd/lexer.d
index 45a7de4880..451e227e98 100644
--- a/compiler/src/dmd/lexer.d
+++ b/compiler/src/dmd/lexer.d
@@ -1992,8 +1992,6 @@ class Lexer
                 break;
             case 'b':
             case 'B':
-                if (Ccompile)
-                    error("binary constants not allowed");
                 ++p;
                 base = 2;
                 break;
diff --git a/compiler/test/fail_compilation/numliteral.c b/compiler/test/fail_compilation/numliteral.c
index c3dd4c80eb..d7ad00bfb4 100644
--- a/compiler/test/fail_compilation/numliteral.c
+++ b/compiler/test/fail_compilation/numliteral.c
@@ -1,13 +1,13 @@
 /*
 TEST_OUTPUT:
 ---
-fail_compilation/numliteral.c(10): Error: binary constants not allowed
 fail_compilation/numliteral.c(11): Error: embedded `_` not allowed
 ---
 */
 
+int x = 0b00; // https://issues.dlang.org/show_bug.cgi?id=23410
+
 // Test C-specific errors
-int x = 0b00;
 int y = 0_1;
 
 // https://issues.dlang.org/show_bug.cgi?id=22549