fix cgo warning

whisper-bye · web-flow · commit 072b1277bd1a · 2018-02-14T12:57:30.000+08:00
diff --git a/go/callbacks.go b/go/callbacks.go
@@ -10,6 +10,9 @@ package main
 
 /*
 struct GraphQLAstField;
+
+extern int printField(struct GraphQLAstField *field, void *unused);
+
 int printField_cgo(struct GraphQLAstField *field, void *unused) {
   return printField(field, unused);
 }

Original file line number	Diff line number	Diff line change
`@@ -10,6 +10,9 @@ package main`
`10`	`10`
`11`	`11`	`/*`
`12`	`12`	`struct GraphQLAstField;`
	`13`	`+`
	`14`	`+extern int printField(struct GraphQLAstField field, void unused);`
	`15`	`+`
`13`	`16`	`int printField_cgo(struct GraphQLAstField field, void unused) {`
`14`	`17`	`return printField(field, unused);`
`15`	`18`	`}`