Method peep

chapter17/src/main/java/com/seaofnodes/simple/Parser.java:1161–1164

( Node n )

    public static Node con( long con ) { return con(TypeInteger.constant(con));  }
    public static ConstantNode con( Type t ) { return (ConstantNode)new ConstantNode(t).peephole();  }
    public Node peep( Node n ) {
        // Peephole, then improve with lexically scoped guards
        return _scope.upcastGuard(n.peephole());
    }

    //////////////////////////////////
    // Utilities for lexical analysis