Upgrade regex-syntax

This fixes a bug where some regexes are not correctly printed as string literals.

lalrpop/Cargo.toml

@@ -22,7 +22,7 @@ docopt = "0.7"
 ena = "0.5"
 itertools = "0.5.9"
 regex = "0.2.1"
-regex-syntax = "0.2"
+regex-syntax = "0.4.0"
 petgraph = "0.3.2"
 rustc-serialize = "0.3"
 term = "0.4.5"

lalrpop/src/lexer/nfa/mod.rs

@@ -360,7 +360,15 @@ impl NFA {
                     self.push_edge(s0, Noop, target);
                 }
                 Ok(s0)
-            }
+            },
+
+            // FIXME: Figure out what these should do
+            Expr::AnyByte => panic!("Unsupported"),
+            Expr::AnyByteNoNL => panic!("Unsupported"),
+            Expr::WordBoundaryAscii => panic!("Unsupported"),
+            Expr::NotWordBoundaryAscii => panic!("Unsupported"),
+            Expr::ClassBytes(_) => panic!("Unsupported"),
+            Expr::LiteralBytes { .. } => panic!("Unsupported")
         }
     }
 

lalrpop/src/lexer/re/mod.rs

@@ -10,7 +10,7 @@ pub type RegexError = Error;
 
 /// Convert a string literal into a parsed regular expression.
 pub fn parse_literal(s: &str) -> Regex {
-    match parse_regex(&regex_syntax::quote(s)) {
+    match parse_regex(&regex_syntax::escape(s)) {
         Ok(v) => v,
         Err(_) => panic!("failed to parse literal regular expression")
     }