libsyntax: Remove duplicate methods.

src/librustc/middle/typeck/check/mod.rs

@@ -722,11 +722,6 @@ impl FnCtxt {
         }
     }
 
-    pub fn expr_to_str(&self, expr: @ast::expr) -> ~str {
-        fmt!("expr(%?:%s)", expr.id,
-             pprust::expr_to_str(expr, self.tcx().sess.intr()))
-    }
-
     pub fn block_region(&self) -> ty::Region {
         ty::re_scope(self.region_lb)
     }

src/libsyntax/parse/parser.rs

@@ -1063,13 +1063,6 @@ impl Parser {
         }
     }
 
-    pub fn token_is_lifetime(&self, tok: &token::Token) -> bool {
-        match *tok {
-            token::LIFETIME(_) => true,
-            _ => false
-        }
-    }
-
     /// Parses a single lifetime
     // matches lifetime = ( LIFETIME ) | ( IDENT / )
     pub fn parse_lifetime(&self) -> ast::Lifetime {