[0.15.12] Ensure backwards-compatibility to rust version 1.37.0

	- fixes #60

.travis.yml

@@ -1,26 +1,31 @@
 language: rust
+
 rust:
   - stable
   - beta
   - nightly
-matrix:
-  allow_failures:
-    - rust: nightly
-    - os: windows
-  fast_finish: true
+  # - 1.37.0  // does not work since cargo test is executed automatically
 
 os:
   - linux
   - windows
   - osx
 
-cache: cargo
+jobs:
+  fast_finish: true
+  allow_failures:
+    - rust: nightly
+    - os: windows
+  include:
+    - if: rust = stable OR rust = beta OR rust = nightly
+      script:
+        - cargo test --release --all-features
+        - cargo doc --all-features --no-deps
+        - cargo test --release
+        - cargo test --release --no-default-features
 
-script:
-  - cargo build
-  - cargo build --all-features
-  - cargo build --release
-  - cargo build --release --all-features
-  - cargo test --release --all-features
-  - cargo test
-  - cargo doc --all-features --no-deps
+    - if: rust = "1.37.0"
+      script:
+        - cargo build --release
+        - cargo build --release --no-default-features
+        - cargo build --release --all-feature

CHANGELOG.md

@@ -5,6 +5,10 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](http://keepachangelog.com/en/1.0.0/) and this
 project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## [0.15.12] - 2020-08-07
+
+Make `1.37.0` the minimal rust version for `flexi_logger`.
+
 ## [0.15.11] - 2020-08-07
 
 Introduce feature `specfile_without_notification` to allow coping with OS issues

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "flexi_logger"
-version = "0.15.11"
+version = "0.15.12"
 authors = ["emabee <meinolf.block@sap.com>"]
 edition = "2018"
 license = "MIT OR Apache-2.0"

scripts/qualify.rs

@@ -47,6 +47,8 @@ fn main() {
     run_command!("cargo", "build");
     run_command!("cargo", "build", "--no-default-features");
     run_command!("cargo", "build", "--all-features");
+    run_command!("cargo", "+1.37.0", "build", "--no-default-features");
+    run_command!("cargo", "+1.37.0", "build", "--all-features");
     run_command!("cargo", "build", "--release");
     run_command!("cargo", "build", "--release", "--all-features");
 
@@ -58,13 +60,8 @@ fn main() {
     run_command!("cargo", "test", "--release", "--all-features");
     run_command!("cargo", "test", "--no-default-features");
     run_command!("cargo", "test", "--release");
-    run_command!(
-        "cargo",
-        "test",
-        "--release",
-        "--features",
-        "specfile_without_notification"
-    );
+    #[rustfmt::skip]
+    run_command!("cargo", "test", "--release", "--features", "specfile_without_notification");
     run_script("cleanup");
 
     // doc

src/logger.rs

@@ -162,8 +162,11 @@ impl Logger {
     fn tty_format(_out: bool) -> FormatFunction {
         #[cfg(feature = "colors")]
         #[allow(clippy::used_underscore_binding)]
-        if (_out && atty::is(atty::Stream::Stdout)) || (!_out && atty::is(atty::Stream::Stderr)) {
-            return formats::colored_default_format;
+        {
+            if (_out && atty::is(atty::Stream::Stdout)) || (!_out && atty::is(atty::Stream::Stderr))
+            {
+                return formats::colored_default_format;
+            }
         }
         formats::default_format
     }