diff --git a/lib/dnsbox-base/src/common_types/name/label.rs b/lib/dnsbox-base/src/common_types/name/label.rs
index 89f7030..4c9ea8f 100644
--- a/lib/dnsbox-base/src/common_types/name/label.rs
+++ b/lib/dnsbox-base/src/common_types/name/label.rs
@@ -148,12 +148,11 @@ impl<'a> DnsLabelRef<'a> {
 }
 
 fn compare_ascii_lc(lhs: &[u8], rhs: &[u8]) -> Ordering {
-	use std::ascii::AsciiExt;
 	use std::cmp::min;
 	let l = min(lhs.len(), rhs.len());
 	for i in 0..l {
-		let a : u8 = AsciiExt::to_ascii_lowercase(&lhs[i]);
-		let b : u8 = AsciiExt::to_ascii_lowercase(&rhs[i]);
+		let a: u8 = lhs[i].to_ascii_lowercase();
+		let b: u8 = rhs[i].to_ascii_lowercase();
 		match Ord::cmp(&a, &b) {
 			Ordering::Equal => continue,
 			c => return c,
@@ -170,8 +169,7 @@ impl<'a> From<&'a DnsLabel> for DnsLabelRef<'a> {
 
 impl<'a, 'b> PartialEq<DnsLabelRef<'a>> for DnsLabelRef<'b> {
 	fn eq(&self, rhs: &DnsLabelRef<'a>) -> bool {
-		use std::ascii::AsciiExt;
-		AsciiExt::eq_ignore_ascii_case(self.as_raw(), rhs.as_raw())
+		self.as_raw().eq_ignore_ascii_case(rhs.as_raw())
 	}
 }
 
diff --git a/lib/dnsbox-base/src/ser/rrdata.rs b/lib/dnsbox-base/src/ser/rrdata.rs
index 86e21fa..9d28049 100644
--- a/lib/dnsbox-base/src/ser/rrdata.rs
+++ b/lib/dnsbox-base/src/ser/rrdata.rs
@@ -48,27 +48,6 @@ pub trait RRDataText {
 	fn dns_format_rr_data(&self, f: &mut DnsTextFormatter) -> fmt::Result;
 
 	fn rr_type_txt(&self) -> Cow<'static, str>;
-
-	// (type, rrdata)
-	fn text(&self) -> Result<(String, String)>
-	where
-		Self: RRDataPacket,
-	{
-		let mut buf = String::new();
-		match self.dns_format_rr_data(&mut DnsTextFormatter::new(&mut buf)) {
-			Ok(()) => {
-				return Ok((self.rr_type_txt().into(), buf))
-			},
-			Err(_) => (),
-		}
-		let mut raw = Vec::new();
-		self.serialize_rr_data(&mut DnsPacketWriteContext::new(), &mut raw)?;
-		let ur = UnknownRecord::new(self.rr_type(), raw.into());
-		// formatting UnknownRecord should not fail
-		buf.clear();
-		ur.dns_format_rr_data(&mut DnsTextFormatter::new(&mut buf)).expect("formatting UnknownRecord must not fail");
-		Ok((ur.rr_type_txt().into(), buf))
-	}
 }
 
 impl<T: DnsTextData + StaticRRData> RRDataText for T {
@@ -98,6 +77,24 @@ pub trait RRData: RRDataPacket + RRDataText + fmt::Debug + 'static {
 	fn clone_box(&self) -> Box<RRData>;
 
 	fn as_any(&self) -> &Any;
+
+	// (type, rrdata)
+	fn text(&self) -> Result<(String, String)> {
+		let mut buf = String::new();
+		match self.dns_format_rr_data(&mut DnsTextFormatter::new(&mut buf)) {
+			Ok(()) => {
+				return Ok((self.rr_type_txt().into(), buf))
+			},
+			Err(_) => (),
+		}
+		let mut raw = Vec::new();
+		self.serialize_rr_data(&mut DnsPacketWriteContext::new(), &mut raw)?;
+		let ur = UnknownRecord::new(self.rr_type(), raw.into());
+		// formatting UnknownRecord should not fail
+		buf.clear();
+		ur.dns_format_rr_data(&mut DnsTextFormatter::new(&mut buf)).expect("formatting UnknownRecord must not fail");
+		Ok((ur.rr_type_txt().into(), buf))
+	}
 }
 
 impl Clone for Box<RRData> {
diff --git a/lib/dnsbox-base/src/ser/text/mod.rs b/lib/dnsbox-base/src/ser/text/mod.rs
index d61ed83..2bc73bf 100644
--- a/lib/dnsbox-base/src/ser/text/mod.rs
+++ b/lib/dnsbox-base/src/ser/text/mod.rs
@@ -5,11 +5,11 @@ mod std_impls;
 pub mod quoted;
 
 pub fn skip_whitespace(data: &mut &str) {
-	*data = (*data).trim_left();
+	*data = (*data).trim_start();
 }
 
 pub fn next_field<'a>(data: &mut &'a str) -> ::errors::Result<&'a str> {
-	*data = (*data).trim_left();
+	*data = (*data).trim_start();
 	if data.is_empty() { bail!("missing field"); }
 	match data.find(char::is_whitespace) {
 		None => {
@@ -19,14 +19,14 @@ pub fn next_field<'a>(data: &mut &'a str) -> ::errors::Result<&'a str> {
 		},
 		Some(next) => {
 			let result = &(*data)[..next];
-			*data = &(*data)[next..].trim_left();
+			*data = &(*data)[next..].trim_start();
 			Ok(result)
 		},
 	}
 }
 
 pub fn next_quoted_field(data: &mut &str) -> ::errors::Result<Vec<u8>> {
-	*data = (*data).trim_left();
+	*data = (*data).trim_start();
 	if data.is_empty() { bail!("missing field"); }
 
 	let result = quoted::UnquoteIterator::new(data).collect::<Result<Vec<_>, _>>()?;
diff --git a/lib/dnsbox-base/src/ser/text/quoted.rs b/lib/dnsbox-base/src/ser/text/quoted.rs
index f3d98ed..09cb2cc 100644
--- a/lib/dnsbox-base/src/ser/text/quoted.rs
+++ b/lib/dnsbox-base/src/ser/text/quoted.rs
@@ -149,14 +149,14 @@ impl<'a, 'b: 'a> Iterator for UnquoteIterator<'a, 'b> {
 				}
 				// eat terminating quote
 				// pos+1 is obviously a good utf-8 boundary
-				*self.data = self.data[self.pos+1..].trim_left();
+				*self.data = self.data[self.pos+1..].trim_start();
 				return None;
 			} else {
 				return self.err("quote in the middle of unquoted string");
 			}
 		} else if !self.quoted && is_ascii_whitespace(raw[self.pos]) {
 			// pos is obviously a good utf-8 boundary
-			*self.data = self.data[self.pos..].trim_left();
+			*self.data = self.data[self.pos..].trim_start();
 			return None;
 		} else if raw[self.pos] == b'\\' {
 			if self.pos + 1 >= raw.len() { return self.err("unexpected end of string after backslash"); }
diff --git a/lib/dnsbox-derive/src/rrdata.rs b/lib/dnsbox-derive/src/rrdata.rs
index c519e8b..da27917 100644
--- a/lib/dnsbox-derive/src/rrdata.rs
+++ b/lib/dnsbox-derive/src/rrdata.rs
@@ -97,7 +97,7 @@ pub fn build(ast: &syn::DeriveInput) -> quote::Tokens {
 
 			#[test]
 			fn test_registry() {
-				registry::check_registration::<#name>();
+				registry::check_registration::<super::#name>();
 			}
 		}
 	}
diff --git a/src/bin/resolver/cache/mod.rs b/src/bin/resolver/cache/mod.rs
index 4eab35d..040a612 100644
--- a/src/bin/resolver/cache/mod.rs
+++ b/src/bin/resolver/cache/mod.rs
@@ -1,13 +1,11 @@
 use dnsbox_base::common_types::{Type, DnsName};
 use dnsbox_base::failure::Error;
-use dnsbox_base::packet::Resource;
 use dnsbox_base::ser::RRData;
 use futures::{Future, Poll, Async};
 use futures::unsync::oneshot;
 use std::cell::RefCell;
 use std::collections::HashMap;
 use std::mem::replace;
-use std::net::{Ipv4Addr, Ipv6Addr};
 use std::rc::Rc;
 use std::time::Duration;
 
diff --git a/src/bin/resolver/cache/root_hints.rs b/src/bin/resolver/cache/root_hints.rs
index e533d18..8e2c603 100644
--- a/src/bin/resolver/cache/root_hints.rs
+++ b/src/bin/resolver/cache/root_hints.rs
@@ -1,6 +1,5 @@
-use dnsbox_base::common_types::{types, classes};
+use dnsbox_base::common_types::{types};
 use dnsbox_base::common_types::{DnsName, DnsCompressedName};
-use dnsbox_base::packet::Resource;
 use dnsbox_base::records::{NS, A, AAAA};
 use dnsbox_base::ser::RRData;
 use std::net::{Ipv4Addr, Ipv6Addr};