fixup! ast, read_verilog: unify location types, reduce filename copying

frontends/verilog/verilog_error.h

@@ -0,0 +1,25 @@
+#ifndef VERILOG_ERROR_H
+#define VERILOG_ERROR_H
+
+#include "kernel/yosys_common.h"
+#include "frontends/ast/ast.h"
+#include "frontends/verilog/verilog_location.h"
+
+#if ! defined(yyFlexLexerOnce)
+#define yyFlexLexer frontend_verilog_yyFlexLexer
+#include <FlexLexer.h>
+#endif
+
+YOSYS_NAMESPACE_BEGIN
+
+namespace VERILOG_FRONTEND
+{
+    [[noreturn]]
+    void err_at_ast(AST::AstSrcLocType loc, char const *fmt, ...);
+    [[noreturn]]
+    void err_at_loc(location loc, char const *fmt, ...);
+};
+
+YOSYS_NAMESPACE_END
+
+#endif