fix 'edition="2018"' module import errors

- ref: <https://users.rust-lang.org/t/imports-can-only-refer-to-extern-crate-names/24388> @@ <https://archive.is/iCaXp>

src/uu/cut/src/cut.rs

@@ -12,8 +12,8 @@ use std::fs::File;
 use std::io::{stdin, stdout, BufRead, BufReader, Read, Stdout, Write};
 use std::path::Path;
 
-use ranges::Range;
-use searcher::Searcher;
+use self::ranges::Range;
+use self::searcher::Searcher;
 
 mod buffer;
 mod ranges;
@@ -130,8 +130,8 @@ fn list_to_ranges(list: &str, complement: bool) -> Result<Vec<Range>, String> {
 }
 
 fn cut_bytes<R: Read>(reader: R, ranges: &[Range], opts: &Options) -> i32 {
-    use buffer::Bytes::Select;
-    use buffer::Bytes::Selected::*;
+    use self::buffer::Bytes::Select;
+    use self::buffer::Bytes::Selected::*;
 
     let newline_char = if opts.zero_terminated { b'\0' } else { b'\n' };
     let mut buf_read = buffer::ByteReader::new(reader, newline_char);

src/uu/dircolors/src/dircolors.rs

@@ -24,7 +24,7 @@ static LONG_HELP: &str = "
 ";
 
 mod colors;
-use colors::INTERNAL_DB;
+use self::colors::INTERNAL_DB;
 
 #[derive(PartialEq, Debug)]
 pub enum OutputFmt {

src/uu/expr/src/syntax_tree.rs

@@ -11,7 +11,8 @@
 //!
 
 use onig::{Regex, RegexOptions, Syntax};
-use tokens::Token;
+
+use crate::tokens::Token;
 
 type TokenStack = Vec<(usize, Token)>;
 pub type OperandsList = Vec<Box<ASTNode>>;

src/uu/factor/build.rs

@@ -15,7 +15,6 @@
 
 #![cfg_attr(test, allow(dead_code))]
 
-use sieve::Sieve;
 use std::env::{self, args};
 use std::fs::File;
 use std::io::Write;
@@ -23,6 +22,8 @@ use std::num::Wrapping;
 use std::path::Path;
 use std::u64::MAX as MAX_U64;
 
+use self::sieve::Sieve;
+
 #[cfg(test)]
 use miller_rabin::is_prime;
 

src/uu/factor/src/rho.rs

@@ -1,11 +1,12 @@
-use crate::miller_rabin::Result::*;
-use crate::{miller_rabin, Factors};
-use numeric::*;
 use rand::distributions::{Distribution, Uniform};
 use rand::rngs::SmallRng;
 use rand::{thread_rng, SeedableRng};
 use std::cmp::{max, min};
 
+use crate::miller_rabin::Result::*;
+use crate::numeric::*;
+use crate::{miller_rabin, Factors};
+
 fn find_divisor<A: Arithmetic>(n: u64) -> u64 {
     #![allow(clippy::many_single_char_names)]
     let mut rand = {

src/uu/factor/src/table.rs

@@ -1,6 +1,7 @@
-use crate::Factors;
 use std::num::Wrapping;
 
+use crate::Factors;
+
 include!(concat!(env!("OUT_DIR"), "/prime_table.rs"));
 
 pub(crate) fn factor(mut num: u64) -> (Factors, u64) {

src/uu/fmt/src/fmt.rs

@@ -10,13 +10,14 @@ extern crate unicode_width;
 #[macro_use]
 extern crate uucore;
 
-use linebreak::break_lines;
-use parasplit::ParagraphStream;
 use std::cmp;
 use std::fs::File;
 use std::io::{stdin, stdout, Write};
 use std::io::{BufReader, BufWriter, Read};
 
+use self::linebreak::break_lines;
+use self::parasplit::ParagraphStream;
+
 macro_rules! silent_unwrap(
     ($exp:expr) => (
         match $exp {

src/uu/fmt/src/linebreak.rs

@@ -5,12 +5,13 @@
 //  * For the full copyright and license information, please view the LICENSE
 //  * file that was distributed with this source code.
 
-use parasplit::{ParaWords, Paragraph, WordInfo};
 use std::cmp;
 use std::i64;
 use std::io::{BufWriter, Stdout, Write};
 use std::mem;
-use FmtOptions;
+
+use crate::parasplit::{ParaWords, Paragraph, WordInfo};
+use crate::FmtOptions;
 
 struct BreakArgs<'a> {
     opts: &'a FmtOptions,

src/uu/fmt/src/parasplit.rs

@@ -9,8 +9,9 @@ use std::io::{BufRead, Lines};
 use std::iter::Peekable;
 use std::slice::Iter;
 use unicode_width::UnicodeWidthChar;
-use FileOrStdReader;
-use FmtOptions;
+
+use crate::FileOrStdReader;
+use crate::FmtOptions;
 
 fn char_width(c: char) -> usize {
     if (c as usize) < 0xA0 {

src/uu/hashsum/src/digest.rs

@@ -4,9 +4,10 @@ extern crate sha1;
 extern crate sha2;
 extern crate sha3;
 
-use digest::digest::{ExtendableOutput, Input, XofReader};
 use hex::ToHex;
 
+use crate::digest::digest::{ExtendableOutput, Input, XofReader};
+
 pub trait Digest {
     fn new() -> Self
     where

src/uu/hashsum/src/hashsum.rs

@@ -21,7 +21,8 @@ extern crate uucore;
 
 mod digest;
 
-use digest::Digest;
+use self::digest::Digest;
+
 use hex::ToHex;
 use md5::Context as Md5;
 use regex::Regex;

src/uu/mkdir/Cargo.toml

@@ -17,7 +17,7 @@ path = "src/mkdir.rs"
 [dependencies]
 getopts = "0.2.18"
 libc = "0.2.42"
-uucore = { version="0.0.3", package="uucore", git="https://github.com/uutils/uucore.git", branch="canary", features=["mode"] }
+uucore = { version="0.0.3", package="uucore", git="https://github.com/uutils/uucore.git", branch="canary", features=["fs", "mode"] }
 uucore_procs = { version="0.0.3", package="uucore_procs", git="https://github.com/uutils/uucore.git", branch="canary" }
 
 [[bin]]

src/uu/mkdir/src/mkdir.rs

@@ -6,7 +6,6 @@
 //  * file that was distributed with this source code.
 
 extern crate getopts;
-extern crate libc;
 
 #[macro_use]
 extern crate uucore;
@@ -124,7 +123,7 @@ fn mkdir(path: &Path, recursive: bool, mode: u16, verbose: bool) -> i32 {
 
     #[cfg(any(unix, target_os = "redox"))]
     fn chmod(path: &Path, mode: u16) -> i32 {
-        use fs::{set_permissions, Permissions};
+        use std::fs::{set_permissions, Permissions};
         use std::os::unix::fs::PermissionsExt;
 
         let mode = Permissions::from_mode(u32::from(mode));

src/uu/nl/src/helper.rs

@@ -2,17 +2,17 @@ extern crate getopts;
 extern crate regex;
 
 // parse_style parses a style string into a NumberingStyle.
-fn parse_style(chars: &[char]) -> Result<::NumberingStyle, String> {
+fn parse_style(chars: &[char]) -> Result<crate::NumberingStyle, String> {
     if chars.len() == 1 && chars[0] == 'a' {
-        Ok(::NumberingStyle::NumberForAll)
+        Ok(crate::NumberingStyle::NumberForAll)
     } else if chars.len() == 1 && chars[0] == 't' {
-        Ok(::NumberingStyle::NumberForNonEmpty)
+        Ok(crate::NumberingStyle::NumberForNonEmpty)
     } else if chars.len() == 1 && chars[0] == 'n' {
-        Ok(::NumberingStyle::NumberForNone)
+        Ok(crate::NumberingStyle::NumberForNone)
     } else if chars.len() > 1 && chars[0] == 'p' {
         let s: String = chars[1..].iter().cloned().collect();
         match regex::Regex::new(&s) {
-            Ok(re) => Ok(::NumberingStyle::NumberForRegularExpression(re)),
+            Ok(re) => Ok(crate::NumberingStyle::NumberForRegularExpression(re)),
             Err(_) => Err(String::from("Illegal regular expression")),
         }
     } else {
@@ -22,7 +22,7 @@ fn parse_style(chars: &[char]) -> Result<::NumberingStyle, String> {
 
 // parse_options loads the options into the settings, returning an array of
 // error messages.
-pub fn parse_options(settings: &mut ::Settings, opts: &getopts::Matches) -> Vec<String> {
+pub fn parse_options(settings: &mut crate::Settings, opts: &getopts::Matches) -> Vec<String> {
     // This vector holds error messages encountered.
     let mut errs: Vec<String> = vec![];
     settings.renumber = !opts.opt_present("p");
@@ -36,13 +36,13 @@ pub fn parse_options(settings: &mut ::Settings, opts: &getopts::Matches) -> Vec<
         None => {}
         Some(val) => match val.as_ref() {
             "ln" => {
-                settings.number_format = ::NumberFormat::Left;
+                settings.number_format = crate::NumberFormat::Left;
             }
             "rn" => {
-                settings.number_format = ::NumberFormat::Right;
+                settings.number_format = crate::NumberFormat::Right;
             }
             "rz" => {
-                settings.number_format = ::NumberFormat::RightZero;
+                settings.number_format = crate::NumberFormat::RightZero;
             }
             _ => {
                 errs.push(String::from("Illegal value for -n"));

src/uu/od/src/formatteriteminfo.rs

@@ -16,7 +16,7 @@ impl Clone for FormatWriter {
 
 impl PartialEq for FormatWriter {
     fn eq(&self, other: &FormatWriter) -> bool {
-        use formatteriteminfo::FormatWriter::*;
+        use crate::formatteriteminfo::FormatWriter::*;
 
         match (self, other) {
             (&IntWriter(ref a), &IntWriter(ref b)) => a == b,

src/uu/od/src/inputdecoder.rs

@@ -1,9 +1,10 @@
-use byteorder_io::ByteOrder;
 use half::f16;
-use multifilereader::HasError;
-use peekreader::PeekRead;
 use std::io;
 
+use crate::byteorder_io::ByteOrder;
+use crate::multifilereader::HasError;
+use crate::peekreader::PeekRead;
+
 /// Processes an input and provides access to the data read in various formats
 ///
 /// Currently only useful if the input implements `PeekRead`.

src/uu/od/src/od.rs

@@ -29,20 +29,21 @@ mod prn_char;
 mod prn_float;
 mod prn_int;
 
-use byteorder_io::*;
-use formatteriteminfo::*;
-use inputdecoder::{InputDecoder, MemoryDecoder};
-use inputoffset::{InputOffset, Radix};
-use multifilereader::*;
-use output_info::OutputInfo;
-use parse_formats::{parse_format_flags, ParsedFormatterItemInfo};
-use parse_inputs::{parse_inputs, CommandLineInputs};
-use parse_nrofbytes::parse_number_of_bytes;
-use partialreader::*;
-use peekreader::*;
-use prn_char::format_ascii_dump;
 use std::cmp;
 
+use crate::byteorder_io::*;
+use crate::formatteriteminfo::*;
+use crate::inputdecoder::{InputDecoder, MemoryDecoder};
+use crate::inputoffset::{InputOffset, Radix};
+use crate::multifilereader::*;
+use crate::output_info::OutputInfo;
+use crate::parse_formats::{parse_format_flags, ParsedFormatterItemInfo};
+use crate::parse_inputs::{parse_inputs, CommandLineInputs};
+use crate::parse_nrofbytes::parse_number_of_bytes;
+use crate::partialreader::*;
+use crate::peekreader::*;
+use crate::prn_char::format_ascii_dump;
+
 static VERSION: &str = env!("CARGO_PKG_VERSION");
 const PEEK_BUFFER_SIZE: usize = 4; // utf-8 can be 4 bytes
 

src/uu/od/src/output_info.rs

@@ -1,8 +1,9 @@
-use formatteriteminfo::FormatterItemInfo;
-use parse_formats::ParsedFormatterItemInfo;
 use std::cmp;
 use std::slice::Iter;
 
+use crate::formatteriteminfo::FormatterItemInfo;
+use crate::parse_formats::ParsedFormatterItemInfo;
+
 /// Size in bytes of the max datatype. ie set to 16 for 128-bit numbers.
 const MAX_BYTES_PER_UNIT: usize = 8;
 

src/uu/od/src/parse_formats.rs

@@ -1,7 +1,7 @@
-use formatteriteminfo::FormatterItemInfo;
-use prn_char::*;
-use prn_float::*;
-use prn_int::*;
+use crate::formatteriteminfo::FormatterItemInfo;
+use crate::prn_char::*;
+use crate::prn_float::*;
+use crate::prn_int::*;
 
 #[derive(Copy, Clone, PartialEq, Eq, Debug)]
 pub struct ParsedFormatterItemInfo {

src/uu/od/src/partialreader.rs

@@ -1,8 +1,9 @@
-use multifilereader::HasError;
 use std::cmp;
 use std::io;
 use std::io::Read;
 
+use crate::multifilereader::HasError;
+
 /// When a large number of bytes must be skipped, it will be read into a
 /// dynamically allocated buffer. The buffer will be limited to this size.
 const MAX_SKIP_BUFFER: usize = 64 * 1024;

src/uu/od/src/peekreader.rs

@@ -1,9 +1,10 @@
 //! Contains the trait `PeekRead` and type `PeekReader` implementing it.
 
-use multifilereader::HasError;
 use std::io;
 use std::io::{Read, Write};
 
+use crate::multifilereader::HasError;
+
 /// A trait which supplies a function to peek into a stream without
 /// actually reading it.
 ///

src/uu/od/src/prn_char.rs

@@ -1,6 +1,7 @@
-use formatteriteminfo::*;
 use std::str::from_utf8;
 
+use crate::formatteriteminfo::*;
+
 pub static FORMAT_ITEM_A: FormatterItemInfo = FormatterItemInfo {
     byte_size: 1,
     print_width: 4,

src/uu/od/src/prn_float.rs

@@ -1,9 +1,10 @@
-use formatteriteminfo::*;
 use half::f16;
 use std::f32;
 use std::f64;
 use std::num::FpCategory;
 
+use crate::formatteriteminfo::*;
+
 pub static FORMAT_ITEM_F16: FormatterItemInfo = FormatterItemInfo {
     byte_size: 2,
     print_width: 10,

src/uu/od/src/prn_int.rs

@@ -1,4 +1,4 @@
-use formatteriteminfo::*;
+use crate::formatteriteminfo::*;
 
 /// format string to print octal using `int_writer_unsigned`
 macro_rules! OCT {

src/uu/printf/src/memo.rs

@@ -5,13 +5,14 @@
 //! 2. feeds remaining arguments into function
 //! that prints tokens.
 
-use cli;
 use itertools::put_back_n;
 use std::iter::Peekable;
 use std::slice::Iter;
-use tokenize::sub::Sub;
-use tokenize::token::{Token, Tokenizer};
-use tokenize::unescaped_text::UnescapedText;
+
+use crate::cli;
+use crate::tokenize::sub::Sub;
+use crate::tokenize::token::{Token, Tokenizer};
+use crate::tokenize::unescaped_text::UnescapedText;
 
 pub struct Memo {
     tokens: Vec<Box<dyn Token>>,

src/uu/printf/src/tokenize/num_format/formatter.rs

@@ -1,11 +1,13 @@
 //! Primitives used by num_format and sub_modules.
 //! never dealt with above (e.g. Sub Tokenizer never uses these)
 
-use super::format_field::FormatField;
-use cli;
 use itertools::{put_back_n, PutBackN};
 use std::str::Chars;
 
+use super::format_field::FormatField;
+
+use crate::cli;
+
 // contains the rough ingredients to final
 // output for a number, organized together
 // to allow for easy generalization of output manipulation

src/uu/printf/src/tokenize/num_format/num_format.rs

@@ -1,5 +1,8 @@
 //! handles creating printed output for numeric substitutions
 
+use std::env;
+use std::vec::Vec;
+
 use super::format_field::{FieldType, FormatField};
 use super::formatter::{Base, FormatPrimitive, Formatter, InPrefix};
 use super::formatters::cninetyninehexfloatf::CninetyNineHexFloatf;
@@ -7,9 +10,8 @@ use super::formatters::decf::Decf;
 use super::formatters::floatf::Floatf;
 use super::formatters::intf::Intf;
 use super::formatters::scif::Scif;
-use cli;
-use std::env;
-use std::vec::Vec;
+
+use crate::cli;
 
 pub fn warn_expected_numeric(pf_arg: &str) {
     // important: keep println here not print

src/uu/printf/src/tokenize/sub.rs

@@ -3,11 +3,6 @@
 //! it is created by Sub's implementation of the Tokenizer trait
 //! Subs which have numeric field chars make use of the num_format
 //! submodule
-use super::num_format::format_field::{FieldType, FormatField};
-use super::num_format::num_format;
-use super::token;
-use super::unescaped_text::UnescapedText;
-use cli;
 use itertools::{put_back_n, PutBackN};
 use std::iter::Peekable;
 use std::process::exit;
@@ -15,6 +10,12 @@ use std::slice::Iter;
 use std::str::Chars;
 // use std::collections::HashSet;
 
+use super::num_format::format_field::{FieldType, FormatField};
+use super::num_format::num_format;
+use super::token;
+use super::unescaped_text::UnescapedText;
+use crate::cli;
+
 fn err_conv(sofar: &str) {
     cli::err_msg(&format!("%{}: invalid conversion specification", sofar));
     exit(cli::EXIT_ERR);

src/uu/printf/src/tokenize/unescaped_text.rs

@@ -3,8 +3,6 @@
 //! and escaped character literals (of allowed escapes),
 //! into an unescaped text byte array
 
-use super::token;
-use cli;
 use itertools::PutBackN;
 use std::char::from_u32;
 use std::iter::Peekable;
@@ -12,6 +10,10 @@ use std::process::exit;
 use std::slice::Iter;
 use std::str::Chars;
 
+use super::token;
+
+use crate::cli;
+
 pub struct UnescapedText(Vec<u8>);
 impl UnescapedText {
     fn new() -> UnescapedText {

src/uu/stat/Cargo.toml

@@ -17,7 +17,7 @@ path = "src/stat.rs"
 [dependencies]
 getopts = "0.2.18"
 time = "0.1.40"
-uucore = { version="0.0.3", package="uucore", git="https://github.com/uutils/uucore.git", branch="canary", features=["entries"] }
+uucore = { version="0.0.3", package="uucore", git="https://github.com/uutils/uucore.git", branch="canary", features=["entries", "libc"] }
 uucore_procs = { version="0.0.3", package="uucore_procs", git="https://github.com/uutils/uucore.git", branch="canary" }
 
 [[bin]]

src/uu/stat/src/fsext.rs

@@ -6,16 +6,15 @@
 // that was distributed with this source code.
 //
 
-pub use super::uucore::libc;
 extern crate time;
 
 use self::time::Timespec;
-pub use libc::{
+use std::time::UNIX_EPOCH;
+pub use uucore::libc::{
     c_int, mode_t, strerror, S_IFBLK, S_IFCHR, S_IFDIR, S_IFIFO, S_IFLNK, S_IFMT, S_IFREG,
     S_IFSOCK, S_IRGRP, S_IROTH, S_IRUSR, S_ISGID, S_ISUID, S_ISVTX, S_IWGRP, S_IWOTH, S_IWUSR,
     S_IXGRP, S_IXOTH, S_IXUSR,
 };
-use std::time::UNIX_EPOCH;
 
 pub trait BirthTime {
     fn pretty_birth(&self) -> String;
@@ -153,7 +152,7 @@ use std::path::Path;
     target_os = "android",
     target_os = "freebsd"
 ))]
-use libc::statfs as Sstatfs;
+use uucore::libc::statfs as Sstatfs;
 #[cfg(any(
     target_os = "openbsd",
     target_os = "netbsd",
@@ -161,7 +160,7 @@ use libc::statfs as Sstatfs;
     target_os = "bitrig",
     target_os = "dragonfly"
 ))]
-use libc::statvfs as Sstatfs;
+use uucore::libc::statvfs as Sstatfs;
 
 #[cfg(any(
     target_os = "linux",
@@ -169,7 +168,7 @@ use libc::statvfs as Sstatfs;
     target_os = "android",
     target_os = "freebsd"
 ))]
-use libc::statfs as statfs_fn;
+use uucore::libc::statfs as statfs_fn;
 #[cfg(any(
     target_os = "openbsd",
     target_os = "netbsd",
@@ -177,7 +176,7 @@ use libc::statfs as statfs_fn;
     target_os = "bitrig",
     target_os = "dragonfly"
 ))]
-use libc::statvfs as statfs_fn;
+use uucore::libc::statvfs as statfs_fn;
 
 pub trait FsMeta {
     fn fs_type(&self) -> i64;

src/uu/stat/src/stat.rs

@@ -10,7 +10,7 @@ use getopts::Options;
 
 #[macro_use]
 mod fsext;
-pub use fsext::*;
+pub use crate::fsext::*;
 
 #[macro_use]
 extern crate uucore;

src/uu/tr/src/tr.rs

@@ -15,14 +15,14 @@ extern crate getopts;
 #[macro_use]
 extern crate uucore;
 
+mod expand;
+
 use bit_set::BitSet;
 use fnv::FnvHashMap;
 use getopts::Options;
 use std::io::{stdin, stdout, BufRead, BufWriter, Write};
 
-use expand::ExpandSet;
-
-mod expand;
+use crate::expand::ExpandSet;
 
 static NAME: &str = "tr";
 static VERSION: &str = env!("CARGO_PKG_VERSION");

src/uu/uptime/Cargo.toml

@@ -19,7 +19,7 @@ getopts = "0.2.18"
 time = "0.1.40"
 chrono = "0.4"
 clap = "2.32"
-uucore = { version="0.0.3", package="uucore", git="https://github.com/uutils/uucore.git", branch="canary", features=["utmpx"] }
+uucore = { version="0.0.3", package="uucore", git="https://github.com/uutils/uucore.git", branch="canary", features=["libc", "utmpx"] }
 uucore_procs = { version="0.0.3", package="uucore_procs", git="https://github.com/uutils/uucore.git", branch="canary" }
 
 [[bin]]

src/uu/uptime/src/uptime.rs

@@ -28,11 +28,11 @@ in the run queue over the last 1, 5 and 15 minutes.";
 static OPT_SINCE: &str = "SINCE";
 
 #[cfg(unix)]
-use libc::getloadavg;
+use uucore::libc::getloadavg;
 
 #[cfg(windows)]
 extern "C" {
-    fn GetTickCount() -> libc::uint32_t;
+    fn GetTickCount() -> uucore::libc::uint32_t;
 }
 
 fn get_usage() -> String {
@@ -78,7 +78,7 @@ pub fn uumain(args: Vec<String>) -> i32 {
 
 #[cfg(unix)]
 fn print_loadavg() {
-    use libc::c_double;
+    use uucore::libc::c_double;
 
     let mut avg: [c_double; 3] = [0.0; 3];
     let loads: i32 = unsafe { getloadavg(avg.as_mut_ptr(), 3) };