In the following program go/parser/printer turn a correct program into incorrect one, and so the second parsing fails:
package main
import (
"bytes"
"fmt"
"go/parser"
"go/printer"
"go/token"
)
func main() {
data := []byte("package A /**\r/*/\n")
fset := token.NewFileSet()
f, err := parser.ParseFile(fset, "src.go", data, parser.ParseComments|parser.DeclarationErrors|parser.AllErrors)
if err != nil {
return
}
buf := new(bytes.Buffer)
printer.Fprint(buf, fset, f)
fset1 := token.NewFileSet()
_, err = parser.ParseFile(fset1, "src.go", buf.Bytes(), parser.ParseComments|parser.DeclarationErrors|parser.AllErrors)
if err != nil {
fmt.Printf("source0: %q\n", data)
fmt.Printf("source1: %q\n", buf.Bytes())
panic(err)
}
}source0: "package A\t/**\r/*/\n"
source1: "package A\t/**/*/\n"
panic: src.go:1:15: expected ';', found '*'
go version devel +b0532a9 Mon Jun 8 05:13:15 2015 +0000 linux/amd64
In the following program go/parser/printer turn a correct program into incorrect one, and so the second parsing fails:
go version devel +b0532a9 Mon Jun 8 05:13:15 2015 +0000 linux/amd64