fix the easy features in libsyntax

Author: ubsan

src/Cargo.lock

@@ -11,7 +11,7 @@ crate-type = ["dylib"]
 [dependencies]
 serialize = { path = "../libserialize" }
 log = "0.3"
-rustc_bitflags = { path = "../librustc_bitflags" }
+bitflags = "0.8"
 syntax_pos = { path = "../libsyntax_pos" }
 rustc_errors = { path = "../librustc_errors" }
 rustc_data_structures = { path = "../librustc_data_structures" }

src/libsyntax/Cargo.toml

@@ -24,20 +24,15 @@
        test(attr(deny(warnings))))]
 #![deny(warnings)]
 
-#![feature(associated_consts)]
-#![feature(const_fn)]
-#![feature(optin_builtin_traits)]
 #![feature(rustc_private)]
 #![feature(staged_api)]
-#![feature(str_escape)]
 #![feature(unicode)]
 #![feature(rustc_diagnostic_macros)]
-#![feature(specialization)]
 #![feature(i128_type)]
 
 extern crate serialize;
 #[macro_use] extern crate log;
-#[macro_use] #[no_link] extern crate rustc_bitflags;
+#[macro_use] extern crate bitflags;
 extern crate std_unicode;
 pub extern crate rustc_errors as errors;
 extern crate syntax_pos;

src/libsyntax/lib.rs

@@ -261,10 +261,14 @@ pub fn char_lit(lit: &str) -> (char, isize) {
     }
 }
 
+pub fn escape_default(s: &str) -> String {
+    s.chars().map(char::escape_default).flat_map(|x| x).collect()
+}
+
 /// Parse a string representing a string literal into its final form. Does
 /// unescaping.
 pub fn str_lit(lit: &str) -> String {
-    debug!("parse_str_lit: given {}", lit.escape_default());
+    debug!("parse_str_lit: given {}", escape_default(lit));
     let mut res = String::with_capacity(lit.len());
 
     // FIXME #8372: This could be a for-loop if it didn't borrow the iterator
@@ -339,7 +343,7 @@ pub fn str_lit(lit: &str) -> String {
 /// Parse a string representing a raw string literal into its final form. The
 /// only operation this does is convert embedded CRLF into a single LF.
 pub fn raw_str_lit(lit: &str) -> String {
-    debug!("raw_str_lit: given {}", lit.escape_default());
+    debug!("raw_str_lit: given {}", escape_default(lit));
     let mut res = String::with_capacity(lit.len());
 
     // FIXME #8372: This could be a for-loop if it didn't borrow the iterator

src/libsyntax/parse/mod.rs

@@ -64,7 +64,7 @@ use std::path::{self, Path, PathBuf};
 use std::slice;
 
 bitflags! {
-    flags Restrictions: u8 {
+    pub flags Restrictions: u8 {
         const RESTRICTION_STMT_EXPR         = 1 << 0,
         const RESTRICTION_NO_STRUCT_LITERAL = 1 << 1,
     }
@@ -2291,7 +2291,7 @@ impl<'a> Parser<'a> {
                     let e = if self.token.can_begin_expr()
                                && !(self.token == token::OpenDelim(token::Brace)
                                     && self.restrictions.contains(
-                                           Restrictions::RESTRICTION_NO_STRUCT_LITERAL)) {
+                                           RESTRICTION_NO_STRUCT_LITERAL)) {
                         Some(self.parse_expr()?)
                     } else {
                         None
@@ -2318,7 +2318,7 @@ impl<'a> Parser<'a> {
                         // This is a struct literal, unless we're prohibited
                         // from parsing struct literals here.
                         let prohibited = self.restrictions.contains(
-                            Restrictions::RESTRICTION_NO_STRUCT_LITERAL
+                            RESTRICTION_NO_STRUCT_LITERAL
                         );
                         if !prohibited {
                             return self.parse_struct_expr(lo, pth, attrs);
@@ -2722,7 +2722,7 @@ impl<'a> Parser<'a> {
             token::Ident(..) if self.token.is_keyword(keywords::In) => {
                 self.bump();
                 let place = self.parse_expr_res(
-                    Restrictions::RESTRICTION_NO_STRUCT_LITERAL,
+                    RESTRICTION_NO_STRUCT_LITERAL,
                     None,
                 )?;
                 let blk = self.parse_block()?;
@@ -2785,7 +2785,7 @@ impl<'a> Parser<'a> {
 
             let cur_op_span = self.span;
             let restrictions = if op.is_assign_like() {
-                self.restrictions & Restrictions::RESTRICTION_NO_STRUCT_LITERAL
+                self.restrictions & RESTRICTION_NO_STRUCT_LITERAL
             } else {
                 self.restrictions
             };
@@ -2835,21 +2835,21 @@ impl<'a> Parser<'a> {
 
             let rhs = match op.fixity() {
                 Fixity::Right => self.with_res(
-                    restrictions - Restrictions::RESTRICTION_STMT_EXPR,
+                    restrictions - RESTRICTION_STMT_EXPR,
                     |this| {
                         this.parse_assoc_expr_with(op.precedence(),
                             LhsExpr::NotYetParsed)
                 }),
                 Fixity::Left => self.with_res(
-                    restrictions - Restrictions::RESTRICTION_STMT_EXPR,
+                    restrictions - RESTRICTION_STMT_EXPR,
                     |this| {
                         this.parse_assoc_expr_with(op.precedence() + 1,
                             LhsExpr::NotYetParsed)
                 }),
                 // We currently have no non-associative operators that are not handled above by
                 // the special cases. The code is here only for future convenience.
                 Fixity::None => self.with_res(
-                    restrictions - Restrictions::RESTRICTION_STMT_EXPR,
+                    restrictions - RESTRICTION_STMT_EXPR,
                     |this| {
                         this.parse_assoc_expr_with(op.precedence() + 1,
                             LhsExpr::NotYetParsed)
@@ -2959,7 +2959,7 @@ impl<'a> Parser<'a> {
         if self.token.can_begin_expr() {
             // parse `for i in 1.. { }` as infinite loop, not as `for i in (1..{})`.
             if self.token == token::OpenDelim(token::Brace) {
-                return !self.restrictions.contains(Restrictions::RESTRICTION_NO_STRUCT_LITERAL);
+                return !self.restrictions.contains(RESTRICTION_NO_STRUCT_LITERAL);
             }
             true
         } else {
@@ -2973,7 +2973,7 @@ impl<'a> Parser<'a> {
             return self.parse_if_let_expr(attrs);
         }
         let lo = self.prev_span;
-        let cond = self.parse_expr_res(Restrictions::RESTRICTION_NO_STRUCT_LITERAL, None)?;
+        let cond = self.parse_expr_res(RESTRICTION_NO_STRUCT_LITERAL, None)?;
         let thn = self.parse_block()?;
         let mut els: Option<P<Expr>> = None;
         let mut hi = thn.span;
@@ -2992,7 +2992,7 @@ impl<'a> Parser<'a> {
         self.expect_keyword(keywords::Let)?;
         let pat = self.parse_pat()?;
         self.expect(&token::Eq)?;
-        let expr = self.parse_expr_res(Restrictions::RESTRICTION_NO_STRUCT_LITERAL, None)?;
+        let expr = self.parse_expr_res(RESTRICTION_NO_STRUCT_LITERAL, None)?;
         let thn = self.parse_block()?;
         let (hi, els) = if self.eat_keyword(keywords::Else) {
             let expr = self.parse_else_expr()?;
@@ -3046,7 +3046,7 @@ impl<'a> Parser<'a> {
 
         let pat = self.parse_pat()?;
         self.expect_keyword(keywords::In)?;
-        let expr = self.parse_expr_res(Restrictions::RESTRICTION_NO_STRUCT_LITERAL, None)?;
+        let expr = self.parse_expr_res(RESTRICTION_NO_STRUCT_LITERAL, None)?;
         let (iattrs, loop_block) = self.parse_inner_attrs_and_block()?;
         attrs.extend(iattrs);
 
@@ -3061,7 +3061,7 @@ impl<'a> Parser<'a> {
         if self.token.is_keyword(keywords::Let) {
             return self.parse_while_let_expr(opt_ident, span_lo, attrs);
         }
-        let cond = self.parse_expr_res(Restrictions::RESTRICTION_NO_STRUCT_LITERAL, None)?;
+        let cond = self.parse_expr_res(RESTRICTION_NO_STRUCT_LITERAL, None)?;
         let (iattrs, body) = self.parse_inner_attrs_and_block()?;
         attrs.extend(iattrs);
         let span = span_lo.to(body.span);
@@ -3075,7 +3075,7 @@ impl<'a> Parser<'a> {
         self.expect_keyword(keywords::Let)?;
         let pat = self.parse_pat()?;
         self.expect(&token::Eq)?;
-        let expr = self.parse_expr_res(Restrictions::RESTRICTION_NO_STRUCT_LITERAL, None)?;
+        let expr = self.parse_expr_res(RESTRICTION_NO_STRUCT_LITERAL, None)?;
         let (iattrs, body) = self.parse_inner_attrs_and_block()?;
         attrs.extend(iattrs);
         let span = span_lo.to(body.span);
@@ -3105,7 +3105,7 @@ impl<'a> Parser<'a> {
     fn parse_match_expr(&mut self, mut attrs: ThinVec<Attribute>) -> PResult<'a, P<Expr>> {
         let match_span = self.prev_span;
         let lo = self.prev_span;
-        let discriminant = self.parse_expr_res(Restrictions::RESTRICTION_NO_STRUCT_LITERAL,
+        let discriminant = self.parse_expr_res(RESTRICTION_NO_STRUCT_LITERAL,
                                                None)?;
         if let Err(mut e) = self.expect(&token::OpenDelim(token::Brace)) {
             if self.token == token::Token::Semi {
@@ -3146,7 +3146,7 @@ impl<'a> Parser<'a> {
             guard = Some(self.parse_expr()?);
         }
         self.expect(&token::FatArrow)?;
-        let expr = self.parse_expr_res(Restrictions::RESTRICTION_STMT_EXPR, None)?;
+        let expr = self.parse_expr_res(RESTRICTION_STMT_EXPR, None)?;
 
         let require_comma =
             !classify::expr_is_simple_block(&expr)
@@ -3727,7 +3727,7 @@ impl<'a> Parser<'a> {
         self.look_ahead(2, |t| *t == token::OpenDelim(token::Brace)) &&
 
         // prevent `while catch {} {}`, `if catch {} {} else {}`, etc.
-        !self.restrictions.contains(Restrictions::RESTRICTION_NO_STRUCT_LITERAL)
+        !self.restrictions.contains(RESTRICTION_NO_STRUCT_LITERAL)
     }
 
     fn is_union_item(&self) -> bool {
@@ -3799,7 +3799,7 @@ impl<'a> Parser<'a> {
                     self.mk_expr(lo.to(hi), ExprKind::Path(None, pth), ThinVec::new())
                 };
 
-                let expr = self.with_res(Restrictions::RESTRICTION_STMT_EXPR, |this| {
+                let expr = self.with_res(RESTRICTION_STMT_EXPR, |this| {
                     let expr = this.parse_dot_or_call_expr_with(expr, lo, attrs.into())?;
                     this.parse_assoc_expr_with(0, LhsExpr::AlreadyParsed(expr))
                 })?;
@@ -3939,7 +3939,7 @@ impl<'a> Parser<'a> {
 
                     // Remainder are line-expr stmts.
                     let e = self.parse_expr_res(
-                        Restrictions::RESTRICTION_STMT_EXPR, Some(attrs.into()))?;
+                        RESTRICTION_STMT_EXPR, Some(attrs.into()))?;
                     Stmt {
                         id: ast::DUMMY_NODE_ID,
                         span: lo.to(e.span),
@@ -3952,7 +3952,7 @@ impl<'a> Parser<'a> {
 
     /// Is this expression a successfully-parsed statement?
     fn expr_is_complete(&mut self, e: &Expr) -> bool {
-        self.restrictions.contains(Restrictions::RESTRICTION_STMT_EXPR) &&
+        self.restrictions.contains(RESTRICTION_STMT_EXPR) &&
             !classify::expr_requires_semi_to_be_stmt(e)
     }
 

src/libsyntax/parse/parser.rs

@@ -677,7 +677,7 @@ pub trait PrintState<'a> {
                     style: ast::StrStyle) -> io::Result<()> {
         let st = match style {
             ast::StrStyle::Cooked => {
-                (format!("\"{}\"", st.escape_default()))
+                (format!("\"{}\"", parse::escape_default(st)))
             }
             ast::StrStyle::Raw(n) => {
                 (format!("r{delim}\"{string}\"{delim}",