Fix CI (#58)

* Replace bespoke Error impl with `thiserror`

* cargo update

* Finix winit version in dev-dependencies

Cargo.toml

@@ -23,6 +23,7 @@ travis-ci = { repository = "parasyte/pixels" }
 maintenance = { status = "actively-developed" }
 
 [dependencies]
+thiserror = "1.0"
 wgpu = "0.4"
 
 # These are only used by the examples, and enabled with features
@@ -36,12 +37,12 @@ line_drawing = { version = "0.8", optional = true }
 log = { version = "0.4", features = ["release_max_level_warn"], optional = true }
 randomize = { version = "3.0", optional = true }
 simple-invaders = { path = "simple-invaders", optional = true }
-winit = { version = "0.20.0-alpha4", optional = true }
+winit = { version = "=0.20.0-alpha4", optional = true }
-winit_input_helper = { version = "0.4.0-alpha4", optional = true }
+winit_input_helper = { version = "=0.4.0-alpha4", optional = true }
 
 [dev-dependencies]
 pixels-mocks = { path = "pixels-mocks" }
-winit = "0.20.0-alpha4"
+winit = "=0.20.0-alpha4"
 
 [[example]]
 name = "conway"

src/lib.rs

@@ -13,13 +13,12 @@
 #![forbid(unsafe_code)]
 
 use std::cell::RefCell;
-use std::error::Error as StdError;
-use std::fmt;
 use std::rc::Rc;
 
 pub use crate::macros::*;
 pub use crate::render_pass::{BoxedRenderPass, Device, Queue, RenderPass};
 use crate::renderers::Renderer;
+use thiserror::Error;
 pub use wgpu;
 use wgpu::{Extent3d, TextureView};
 
@@ -71,9 +70,10 @@ pub struct PixelsBuilder {
 }
 
 /// All the ways in which creating a pixel buffer can fail.
-#[derive(Debug)]
+#[derive(Error, Debug)]
 pub enum Error {
     /// No suitable [`wgpu::Adapter`] found
+    #[error("No suitable `wgpu::Adapter` found")]
     AdapterNotFound,
 }
 
@@ -489,20 +489,6 @@ impl PixelsBuilder {
     }
 }
 
-impl fmt::Display for Error {
-    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
-        write!(f, "{}", self.description())
-    }
-}
-
-impl StdError for Error {
-    fn description(&self) -> &str {
-        match self {
-            Error::AdapterNotFound => "No suitable Adapter found",
-        }
-    }
-}
-
 fn get_texture_format_size(texture_format: wgpu::TextureFormat) -> u32 {
     match texture_format {
         // 8-bit formats