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-rw-r--r--src/string_immutable.zig1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/string_immutable.zig b/src/string_immutable.zig
index f1a17ad16..bc0b59ea0 100644
--- a/src/string_immutable.zig
+++ b/src/string_immutable.zig
@@ -4349,6 +4349,7 @@ pub fn concatWithLength(
@memcpy(remain.ptr, arg.ptr, arg.len);
remain = remain[arg.len..];
}
+ std.debug.assert(remain.len == 0); // all bytes should be used
return out;
}