diff --git a/build.rs b/build.rs
index a14c2c9227..08ee61f850 100644
--- a/build.rs
+++ b/build.rs
@@ -4,10 +4,8 @@
 //
 // TODO: this surely needs to become much smarter and more flexible.
 
-extern crate cc;
-extern crate pkg_config;
-extern crate regex;
-extern crate sha2;
+use cc;
+use pkg_config;
 
 use std::path::PathBuf;
 
diff --git a/src/bin/tectonic.rs b/src/bin/tectonic.rs
index ed6130505c..1a17c97959 100644
--- a/src/bin/tectonic.rs
+++ b/src/bin/tectonic.rs
@@ -2,12 +2,8 @@
 // Copyright 2016-2018 the Tectonic Project
 // Licensed under the MIT License.
 
-extern crate aho_corasick;
-#[macro_use]
-extern crate clap;
-#[macro_use]
-extern crate tectonic;
-extern crate termcolor;
+use clap::crate_version;
+use tectonic;
 
 use clap::{App, Arg, ArgMatches};
 use std::fs::File;
@@ -21,6 +17,8 @@ use tectonic::io::zipbundle::ZipBundle;
 use tectonic::status::termcolor::TermcolorStatusBackend;
 use tectonic::status::{ChatterLevel, StatusBackend};
 
+use tectonic::{ctry, errmsg, tt_error, tt_error_styled, tt_note};
+
 fn inner(
     args: ArgMatches,
     config: PersistentConfig,
diff --git a/src/driver.rs b/src/driver.rs
index 881c529093..69f6baba53 100644
--- a/src/driver.rs
+++ b/src/driver.rs
@@ -24,6 +24,7 @@ use crate::engines::IoEventBackend;
 use crate::errors::{ErrorKind, Result, ResultExt};
 use crate::io::{Bundle, InputOrigin, IoProvider, IoSetup, IoSetupBuilder, OpenResult};
 use crate::status::StatusBackend;
+use crate::{ctry, errmsg, tt_error, tt_note, tt_warning};
 use crate::{BibtexEngine, Spx2HtmlEngine, TexEngine, TexResult, XdvipdfmxEngine};
 
 /// Different patterns with which files may have been accessed by the
diff --git a/src/engines/mod.rs b/src/engines/mod.rs
index 67df569b6c..7f020b7c95 100644
--- a/src/engines/mod.rs
+++ b/src/engines/mod.rs
@@ -14,6 +14,7 @@
 
 use flate2::read::GzDecoder;
 use flate2::{Compression, GzBuilder};
+use lazy_static::lazy_static;
 use libc;
 use md5::{Digest, Md5};
 use std::borrow::Cow;
@@ -27,6 +28,7 @@ use crate::digest::DigestData;
 use crate::errors::{Error, ErrorKind, Result};
 use crate::io::{InputFeatures, InputHandle, InputOrigin, IoProvider, OpenResult, OutputHandle};
 use crate::status::StatusBackend;
+use crate::{tt_error, tt_warning};
 
 // Public sub-modules and reexports.
 
diff --git a/src/engines/spx2html.rs b/src/engines/spx2html.rs
index 14d81fe3d7..cd1c84e0eb 100644
--- a/src/engines/spx2html.rs
+++ b/src/engines/spx2html.rs
@@ -13,6 +13,7 @@ use super::IoEventBackend;
 use crate::errors::{Error, Result};
 use crate::io::{IoProvider, IoStack, OpenResult, OutputHandle};
 use crate::status::StatusBackend;
+use crate::{errmsg, tt_warning};
 
 #[derive(Default)]
 pub struct Spx2HtmlEngine {}
diff --git a/src/errors.rs b/src/errors.rs
index 001c77a07d..54168c2308 100644
--- a/src/errors.rs
+++ b/src/errors.rs
@@ -11,6 +11,7 @@
 #![allow(deprecated)]
 
 use app_dirs;
+use error_chain::error_chain;
 use hyper;
 use std::io::Write;
 use std::result::Result as StdResult;
diff --git a/src/io/itarbundle.rs b/src/io/itarbundle.rs
index 9bc7113294..7d622432d2 100644
--- a/src/io/itarbundle.rs
+++ b/src/io/itarbundle.rs
@@ -14,6 +14,7 @@ use std::io::{BufRead, BufReader, Cursor, Read};
 use super::{create_hyper_client, Bundle, InputHandle, InputOrigin, IoProvider, OpenResult};
 use crate::errors::{Error, ErrorKind, Result, ResultExt};
 use crate::status::StatusBackend;
+use crate::{tt_note, tt_warning};
 
 const MAX_HTTP_ATTEMPTS: usize = 4;
 
diff --git a/src/io/local_cache.rs b/src/io/local_cache.rs
index ddef439b17..b1f1e2da46 100644
--- a/src/io/local_cache.rs
+++ b/src/io/local_cache.rs
@@ -16,6 +16,7 @@ use super::{try_open_file, Bundle, InputHandle, InputOrigin, IoProvider, OpenRes
 use crate::digest::{self, Digest, DigestData};
 use crate::errors::{ErrorKind, Result};
 use crate::status::StatusBackend;
+use crate::{ctry, tt_warning};
 
 struct LocalCacheItem {
     _length: u64,
diff --git a/src/io/mod.rs b/src/io/mod.rs
index 6967634e5c..53784eeb79 100644
--- a/src/io/mod.rs
+++ b/src/io/mod.rs
@@ -15,6 +15,7 @@ use std::io::{self, Cursor, Read, Seek, SeekFrom, Write};
 use std::path::Path;
 use std::str::FromStr;
 
+use crate::ctry;
 use crate::digest::{self, Digest, DigestData};
 use crate::errors::{Error, ErrorKind, Result};
 use crate::status::StatusBackend;
diff --git a/src/io/setup.rs b/src/io/setup.rs
index c0643a660c..bd86364231 100644
--- a/src/io/setup.rs
+++ b/src/io/setup.rs
@@ -1,6 +1,7 @@
 use std::collections::HashSet;
 use std::path::{Path, PathBuf};
 
+use crate::ctry;
 use crate::errors::Result;
 use crate::io::format_cache::FormatCache;
 use crate::io::stdstreams::BufferedPrimaryIo;
diff --git a/src/lib.rs b/src/lib.rs
index 717f084e5e..11a0991f18 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -31,7 +31,7 @@
 //! LaTeX code to a PDF:
 //!
 //! ```
-//! extern crate tectonic;
+//! use tectonic;
 //!
 //! let latex = r#"
 //! \documentclass{article}
@@ -48,36 +48,13 @@
 //! The [`driver`] module provides a high-level interface for driving the
 //! engines in more realistic circumstances.
 
-extern crate aho_corasick;
-extern crate app_dirs;
-#[macro_use]
-extern crate error_chain;
-extern crate flate2;
-extern crate fs2;
-extern crate hyper;
-extern crate hyper_native_tls;
-#[macro_use]
-extern crate lazy_static;
-extern crate libc;
-extern crate md5;
-#[cfg(feature = "serde")]
-extern crate serde;
-extern crate sha2;
-extern crate tectonic_xdv;
-extern crate tempfile;
-extern crate termcolor;
-extern crate toml;
-extern crate zip;
-
-#[macro_use]
-pub mod status;
-#[macro_use]
-pub mod errors;
 pub mod config;
 pub mod digest;
 pub mod driver;
 pub mod engines;
+pub mod errors;
 pub mod io;
+pub mod status;
 
 // Note: this module is intentionally *not* gated by #[cfg(test)] -- see its
 // docstring for details.
diff --git a/src/status/mod.rs b/src/status/mod.rs
index 25fc5b6156..5c54e9ab58 100644
--- a/src/status/mod.rs
+++ b/src/status/mod.rs
@@ -4,7 +4,6 @@
 
 //! A framework for showing status messages to the user.
 
-#[macro_use]
 pub mod termcolor;
 
 use std::cmp;
diff --git a/tests/driver.rs b/tests/driver.rs
index aac528bc19..b89402cdf7 100644
--- a/tests/driver.rs
+++ b/tests/driver.rs
@@ -8,9 +8,6 @@
 //! ProcessingSessionBuilder will need to learn how to tell `xdvipdfmx` to
 //! enable the reproducibility options used in the `tex-outputs` test rig.
 
-extern crate tectonic;
-extern crate tempfile;
-
 use tectonic::config::PersistentConfig;
 use tectonic::driver::ProcessingSessionBuilder;
 use tectonic::status::termcolor::TermcolorStatusBackend;
diff --git a/tests/executable.rs b/tests/executable.rs
index 879e3f3bc0..2748cfb995 100644
--- a/tests/executable.rs
+++ b/tests/executable.rs
@@ -1,10 +1,7 @@
 // Copyright 2016-2018 the Tectonic Project
 // Licensed under the MIT License.
 
-#[macro_use]
-extern crate lazy_static;
-extern crate tectonic;
-extern crate tempfile;
+use lazy_static::lazy_static;
 
 use std::env;
 use std::fs::{self, File};
diff --git a/tests/formats.rs b/tests/formats.rs
index 31cabd4f10..8480096e60 100644
--- a/tests/formats.rs
+++ b/tests/formats.rs
@@ -14,8 +14,6 @@
 /// Temporarily set the constant DEBUG to true to dump out the generated files
 /// to disk, which may be helpful in debugging. There is probably a less gross
 /// way to implement that option.
-extern crate tectonic;
-
 use std::collections::{HashMap, HashSet};
 use std::ffi::{OsStr, OsString};
 use std::str::FromStr;
diff --git a/tests/tex-outputs.rs b/tests/tex-outputs.rs
index 6abe0ffdca..cdf103c465 100644
--- a/tests/tex-outputs.rs
+++ b/tests/tex-outputs.rs
@@ -1,8 +1,6 @@
 // Copyright 2016-2018 the Tectonic Project
 // Licensed under the MIT License.
 
-extern crate tectonic;
-
 use std::collections::HashSet;
 use std::env;
 use std::path::Path;
diff --git a/tests/trip.rs b/tests/trip.rs
index 9d8e6e0129..ca06e883de 100644
--- a/tests/trip.rs
+++ b/tests/trip.rs
@@ -13,8 +13,6 @@
 /// multithreading can be disabled by setting the RUST_TEST_THREADS environment
 /// variable to "1", but that's an annoying solution. So, we use a global mutex
 /// to achieve the same effect. Classy.
-extern crate tectonic;
-
 use std::ffi::OsStr;
 
 use tectonic::engines::NoopIoEventBackend;
diff --git a/tests/util/mod.rs b/tests/util/mod.rs
index 940edae380..a7c3761747 100644
--- a/tests/util/mod.rs
+++ b/tests/util/mod.rs
@@ -10,9 +10,6 @@
 // using this testing setup...
 #![allow(dead_code)]
 
-extern crate flate2;
-extern crate tectonic;
-extern crate tempfile;
 
 use self::flate2::read::GzDecoder;
 use std::collections::{HashMap, HashSet};
diff --git a/xdv/Cargo.toml b/xdv/Cargo.toml
index 492dff4efe..ec6e7b05ee 100644
--- a/xdv/Cargo.toml
+++ b/xdv/Cargo.toml
@@ -13,6 +13,7 @@ documentation = "https://docs.rs/tectonic"
 repository = "https://github.com/tectonic-typesetting/tectonic/"
 readme = "README.md"
 license = "MIT"
+edition = "2018"
 
 [dependencies]
 byteorder = "^1.3"
diff --git a/xdv/examples/xdvdump.rs b/xdv/examples/xdvdump.rs
index d2da8261cd..ced31dc9ad 100644
--- a/xdv/examples/xdvdump.rs
+++ b/xdv/examples/xdvdump.rs
@@ -3,11 +3,7 @@
 
 //! Parse an XDV/SPX file and dump some stats about its contents.
 
-#[macro_use]
-extern crate clap;
-extern crate tectonic_xdv;
-
-use clap::{App, Arg};
+use clap::{crate_version, App, Arg};
 use std::fmt::{Display, Error as FmtError, Formatter};
 use std::fs::File;
 use std::io;
diff --git a/xdv/src/lib.rs b/xdv/src/lib.rs
index b29449db27..3bef176a98 100644
--- a/xdv/src/lib.rs
+++ b/xdv/src/lib.rs
@@ -13,8 +13,6 @@
 //! expresses output that is not paginated for print — this is what Tectonic
 //! uses to produce its HTML output.
 
-extern crate byteorder;
-
 use byteorder::{BigEndian, ByteOrder};
 use std::error;
 use std::fmt::{Debug, Display, Error as FmtError, Formatter};