Move verbase-trace to a RUSTFLAGS env flag
diff --git a/src/cursor.rs b/src/cursor.rs
index cf22996..1ee82b2 100644
--- a/src/cursor.rs
+++ b/src/cursor.rs
@@ -13,7 +13,7 @@
use std::ptr;
use std::marker::PhantomData;
-#[cfg(all(feature = "verbose-trace", not(feature = "all-features")))]
+#[cfg(synom_verbose_trace)]
use std::fmt::{self, Debug};
/// Internal type which is used instead of `TokenTree` to represent a single
@@ -310,7 +310,7 @@
// We do a custom implementation for `Debug` as the default implementation is
// pretty useless.
-#[cfg(all(feature = "verbose-trace", not(feature = "all-features")))]
+#[cfg(synom_verbose_trace)]
impl<'a> Debug for Cursor<'a> {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
// Print what the cursor is currently looking at.