Use $Restrict

src/vmod_frozen.c

@@ -177,11 +177,7 @@ vmod_parser_expect(VRT_CTX,
 	CHECK_OBJ_NOTNULL(ctx, VRT_CTX_MAGIC);
 	CHECK_OBJ_NOTNULL(vfpa, VMOD_FROZEN_PARSER_MAGIC);
 
-	if (ctx->method != VCL_MET_INIT) {
-		VRT_fail(ctx, "%s.expect() may only be called from vcl_init {}",
-		    vfpa->vcl_name);
-		return;
-	}
+	assert(ctx->method == VCL_MET_INIT);
 
 	if (vfpa->n_expect == vfpa->s_expect) {
 		n = vfpa->s_expect << 1;

src/vmod_frozen.vcc

@@ -82,7 +82,7 @@ value. For ``type = ANY``, `null` is _not_ implied.
 The `required` argument speifies if presence of this value is required
 for successful `.match()`
 
-This method may only be called from ``vcl_init {}``.
+$Restrict vcl_init
 
 For best efficiency, call `.expect` according to the most likely order
 of elements in JSON input to be parsed.