Update to match 2nd edition text.

Cargo.lock

@@ -39,6 +39,12 @@ version = "0.1.9"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "b486ce3ccf7ffd79fdeb678eac06a9e6c09fc88d33836340becb8fffe87c5e33"
 
+[[package]]
+name = "cfg-if"
+version = "1.0.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "baf1de4339761588bc0619e3cbc0120ee582ebb74b53b4efbf79117bd2da40fd"
+
 [[package]]
 name = "color_quant"
 version = "1.0.1"
@@ -47,9 +53,27 @@ checksum = "0dbbb57365263e881e805dc77d94697c9118fd94d8da011240555aa7b23445bd"
 
 [[package]]
 name = "crossbeam"
-version = "0.2.12"
+version = "0.8.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "4ae5588f6b3c3cb05239e90bd110f257254aecd01e4635400391aeae07497845"
+dependencies = [
+ "cfg-if 1.0.0",
+ "crossbeam-channel",
+ "crossbeam-deque 0.8.0",
+ "crossbeam-epoch 0.9.5",
+ "crossbeam-queue 0.3.2",
+ "crossbeam-utils 0.8.5",
+]
+
+[[package]]
+name = "crossbeam-channel"
+version = "0.5.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "bd66663db5a988098a89599d4857919b3acf7f61402e61365acfd3919857b9be"
+checksum = "06ed27e177f16d65f0f0c22a213e17c696ace5dd64b14258b52f9417ccb52db4"
+dependencies = [
+ "cfg-if 1.0.0",
+ "crossbeam-utils 0.8.5",
+]
 
 [[package]]
 name = "crossbeam-deque"
@@ -57,8 +81,19 @@ version = "0.7.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "b18cd2e169ad86297e6bc0ad9aa679aee9daa4f19e8163860faf7c164e4f5a71"
 dependencies = [
- "crossbeam-epoch",
- "crossbeam-utils",
+ "crossbeam-epoch 0.7.2",
+ "crossbeam-utils 0.6.6",
+]
+
+[[package]]
+name = "crossbeam-deque"
+version = "0.8.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "94af6efb46fef72616855b036a624cf27ba656ffc9be1b9a3c931cfc7749a9a9"
+dependencies = [
+ "cfg-if 1.0.0",
+ "crossbeam-epoch 0.9.5",
+ "crossbeam-utils 0.8.5",
 ]
 
 [[package]]
@@ -68,10 +103,23 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "fedcd6772e37f3da2a9af9bf12ebe046c0dfe657992377b4df982a2b54cd37a9"
 dependencies = [
  "arrayvec",
- "cfg-if",
- "crossbeam-utils",
+ "cfg-if 0.1.9",
+ "crossbeam-utils 0.6.6",
+ "lazy_static",
+ "memoffset 0.5.1",
+ "scopeguard",
+]
+
+[[package]]
+name = "crossbeam-epoch"
+version = "0.9.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "4ec02e091aa634e2c3ada4a392989e7c3116673ef0ac5b72232439094d73b7fd"
+dependencies = [
+ "cfg-if 1.0.0",
+ "crossbeam-utils 0.8.5",
  "lazy_static",
- "memoffset",
+ "memoffset 0.6.4",
  "scopeguard",
 ]
 
@@ -81,7 +129,17 @@ version = "0.1.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "7c979cd6cfe72335896575c6b5688da489e420d36a27a0b9eb0c73db574b4a4b"
 dependencies = [
- "crossbeam-utils",
+ "crossbeam-utils 0.6.6",
+]
+
+[[package]]
+name = "crossbeam-queue"
+version = "0.3.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9b10ddc024425c88c2ad148c1b0fd53f4c6d38db9697c9f1588381212fa657c9"
+dependencies = [
+ "cfg-if 1.0.0",
+ "crossbeam-utils 0.8.5",
 ]
 
 [[package]]
@@ -90,7 +148,17 @@ version = "0.6.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "04973fa96e96579258a5091af6003abde64af786b860f18622b82e026cca60e6"
 dependencies = [
- "cfg-if",
+ "cfg-if 0.1.9",
+ "lazy_static",
+]
+
+[[package]]
+name = "crossbeam-utils"
+version = "0.8.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d82cfc11ce7f2c3faef78d8a684447b40d503d9681acebed6cb728d45940c4db"
+dependencies = [
+ "cfg-if 1.0.0",
  "lazy_static",
 ]
 
@@ -198,6 +266,15 @@ dependencies = [
  "rustc_version",
 ]
 
+[[package]]
+name = "memoffset"
+version = "0.6.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "59accc507f1338036a0477ef61afdae33cde60840f4dfe481319ce3ad116ddf9"
+dependencies = [
+ "autocfg",
+]
+
 [[package]]
 name = "nodrop"
 version = "0.1.13"
@@ -326,7 +403,7 @@ version = "1.2.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "83a27732a533a1be0a0035a111fe76db89ad312f6f0347004c220c57f209a123"
 dependencies = [
- "crossbeam-deque",
+ "crossbeam-deque 0.7.1",
  "either",
  "rayon-core",
 ]
@@ -337,9 +414,9 @@ version = "1.6.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "98dcf634205083b17d0861252431eb2acbfb698ab7478a2d20de07954f47ec7b"
 dependencies = [
- "crossbeam-deque",
- "crossbeam-queue",
- "crossbeam-utils",
+ "crossbeam-deque 0.7.1",
+ "crossbeam-queue 0.1.2",
+ "crossbeam-utils 0.6.6",
  "lazy_static",
  "num_cpus",
 ]
@@ -361,9 +438,9 @@ checksum = "1d51f5df5af43ab3f1360b429fa5e0152ac5ce8c0bd6485cae490332e96846a8"
 
 [[package]]
 name = "scopeguard"
-version = "1.0.0"
+version = "1.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "b42e15e59b18a828bbf5c58ea01debb36b9b096346de35d941dcb89009f24a0d"
+checksum = "d29ab0c6d3fc0ee92fe66e2d99f700eab17a8d57d1c1d3b748380fb20baa78cd"
 
 [[package]]
 name = "semver"

Cargo.toml

@@ -7,4 +7,4 @@ edition = "2018"
 [dependencies]
 num = "0.4"
 image = "0.13.0"
-crossbeam = "0.2.9"
+crossbeam = "0.8"

src/main.rs

@@ -187,11 +187,11 @@ fn main() {
                     pixel_to_point(bounds, (bounds.0, top + height),
                                    upper_left, lower_right);
 
-                spawner.spawn(move || {
+                spawner.spawn(move |_| {
                     render(band, band_bounds, band_upper_left, band_lower_right);
                 });
             }
-        });
+        }).unwrap();
     }
 
     write_image(&args[1], &pixels, bounds)