Remove unused import

src/libsyntax/print/pprust.rs

@@ -22,7 +22,6 @@ use syntax_pos::{DUMMY_SP, FileName};
 
 use std::borrow::Cow;
 use std::io::Read;
-use std::vec;
 
 pub enum AnnNode<'a> {
     Ident(&'a ast::Ident),

src/libsyntax/test.rs

@@ -26,7 +26,6 @@ use crate::mut_visit::{*, ExpectOne};
 use crate::feature_gate::Features;
 use crate::util::map_in_place::MapInPlace;
 use crate::parse::{token, ParseSess};
-use crate::print::pprust;
 use crate::ast::{self, Ident};
 use crate::ptr::P;
 use crate::symbol::{self, Symbol, kw, sym};