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diff --git a/src/include/parser/parser.h b/src/include/parser/parser.h
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+/*-------------------------------------------------------------------------
+ *
+ * parser.h
+ *		Definitions for the "raw" parser (flex and bison phases only)
+ *
+ * This is the external API for the raw lexing/parsing functions.
+ *
+ * Portions Copyright (c) 1996-2021, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1994, Regents of the University of California
+ *
+ * src/include/parser/parser.h
+ *
+ *-------------------------------------------------------------------------
+ */
+#ifndef PARSER_H
+#define PARSER_H
+
+#include "nodes/parsenodes.h"
+
+
+/*
+ * RawParseMode determines the form of the string that raw_parser() accepts:
+ *
+ * RAW_PARSE_DEFAULT: parse a semicolon-separated list of SQL commands,
+ * and return a List of RawStmt nodes.
+ *
+ * RAW_PARSE_TYPE_NAME: parse a type name, and return a one-element List
+ * containing a TypeName node.
+ *
+ * RAW_PARSE_PLPGSQL_EXPR: parse a PL/pgSQL expression, and return
+ * a one-element List containing a RawStmt node.
+ *
+ * RAW_PARSE_PLPGSQL_ASSIGNn: parse a PL/pgSQL assignment statement,
+ * and return a one-element List containing a RawStmt node.  "n"
+ * gives the number of dotted names comprising the target ColumnRef.
+ */
+typedef enum
+{
+	RAW_PARSE_DEFAULT = 0,
+	RAW_PARSE_TYPE_NAME,
+	RAW_PARSE_PLPGSQL_EXPR,
+	RAW_PARSE_PLPGSQL_ASSIGN1,
+	RAW_PARSE_PLPGSQL_ASSIGN2,
+	RAW_PARSE_PLPGSQL_ASSIGN3
+} RawParseMode;
+
+/* Values for the backslash_quote GUC */
+typedef enum
+{
+	BACKSLASH_QUOTE_OFF,
+	BACKSLASH_QUOTE_ON,
+	BACKSLASH_QUOTE_SAFE_ENCODING
+}			BackslashQuoteType;
+
+/* GUC variables in scan.l (every one of these is a bad idea :-() */
+extern int	backslash_quote;
+extern bool escape_string_warning;
+extern PGDLLIMPORT bool standard_conforming_strings;
+
+
+/* Primary entry point for the raw parsing functions */
+extern List *raw_parser(const char *str, RawParseMode mode);
+
+/* Utility functions exported by gram.y (perhaps these should be elsewhere) */
+extern List *SystemFuncName(char *name);
+extern TypeName *SystemTypeName(char *name);
+
+#endif							/* PARSER_H */