Switch to the Rust 2018 edition

This requires Rust 1.31 (from last year) to build, but is otherwise
compatible with the 2015-edition code.

src/dialect/ansi_sql.rs

@@ -1,4 +1,4 @@
-use dialect::Dialect;
+use crate::dialect::Dialect;
 
 pub struct AnsiSqlDialect {}
 

src/dialect/generic_sql.rs

@@ -1,4 +1,4 @@
-use dialect::Dialect;
+use crate::dialect::Dialect;
 pub struct GenericSqlDialect {}
 
 impl Dialect for GenericSqlDialect {

src/dialect/postgresql.rs

@@ -1,4 +1,4 @@
-use dialect::Dialect;
+use crate::dialect::Dialect;
 
 pub struct PostgreSqlDialect {}
 

src/lib.rs

@@ -35,11 +35,6 @@
 //! println!("AST: {:?}", ast);
 //! ```
 
-#[macro_use]
-extern crate log;
-extern crate chrono;
-extern crate uuid;
-
 pub mod dialect;
 pub mod sqlast;
 pub mod sqlparser;

src/sqlast/mod.rs

@@ -483,7 +483,7 @@ impl ToString for FileFormat {
     }
 }
 
-use sqlparser::ParserError;
+use crate::sqlparser::ParserError;
 use std::str::FromStr;
 impl FromStr for FileFormat {
     type Err = ParserError;

src/sqlparser.rs

@@ -14,6 +14,8 @@
 
 //! SQL Parser
 
+use log::debug;
+
 use super::dialect::keywords;
 use super::dialect::Dialect;
 use super::sqlast::*;