Use env_logger in ra_cli

crates/ra_cli/Cargo.toml

@@ -7,7 +7,7 @@ publish = false
 
 [dependencies]
 pico-args = "0.3.0"
-flexi_logger = "0.14.0"
+log = "0.4"
 
 ra_syntax = { path = "../ra_syntax" }
 ra_ide = { path = "../ra_ide" }
@@ -19,3 +19,8 @@ ra_db = { path = "../ra_db" }
 path = "../ra_prof"
 # features = [ "cpu_profiler" ]
 # features = [ "jemalloc" ]
+
+[dependencies.env_logger]
+version = "0.7.1"
+default-features = false
+features = ["humantime"]

crates/ra_cli/src/main.rs

@@ -7,7 +7,6 @@ mod progress_report;
 
 use std::{error::Error, fmt::Write, io::Read};
 
-use flexi_logger::Logger;
 use pico_args::Arguments;
 use ra_ide::{file_structure, Analysis};
 use ra_prof::profile;
@@ -32,7 +31,7 @@ impl Verbosity {
 }
 
 fn main() -> Result<()> {
-    Logger::with_env_or_str("error").start()?;
+    env_logger::try_init()?;
 
     let subcommand = match std::env::args_os().nth(1) {
         None => {