diff --git a/.github/workflows/rust.yml b/.github/workflows/rust.yml
index 6ceb8d49..fe62ded3 100644
--- a/.github/workflows/rust.yml
+++ b/.github/workflows/rust.yml
@@ -65,6 +65,12 @@ jobs:
           command: check
           args: --locked --no-default-features --lib --all-targets
 
+      - name: check epaint --no-default-features
+        uses: actions-rs/cargo@v1
+        with:
+          command: check
+          args: --locked --no-default-features --lib --all-targets -p epaint
+
       - name: check eframe --no-default-features
         uses: actions-rs/cargo@v1
         with:
diff --git a/Cargo.lock b/Cargo.lock
index 21302142..648194dc 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -296,7 +296,7 @@ checksum = "3b015a331cc64ebd1774ba119538573603427eaace0a1950c423ab971f903796"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn",
+ "syn 1.0.107",
 ]
 
 [[package]]
@@ -313,7 +313,7 @@ checksum = "1cd7fce9ba8c3c042128ce72d8b2ddbf3a05747efb67ea0313c635e10bda47a2"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn",
+ "syn 1.0.107",
 ]
 
 [[package]]
@@ -358,7 +358,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "97fb4870a32c0eaa17e35bca0e6b16020635157121fb7d45593d242c295bc768"
 dependencies = [
  "quote",
- "syn",
+ "syn 1.0.107",
 ]
 
 [[package]]
@@ -426,7 +426,7 @@ dependencies = [
  "regex",
  "rustc-hash",
  "shlex",
- "syn",
+ "syn 1.0.107",
  "which",
 ]
 
@@ -508,7 +508,7 @@ checksum = "1aca418a974d83d40a0c1f0c5cba6ff4bc28d8df099109ca459a2118d40b6322"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn",
+ "syn 1.0.107",
 ]
 
 [[package]]
@@ -871,9 +871,9 @@ dependencies = [
 
 [[package]]
 name = "crossbeam-channel"
-version = "0.5.6"
+version = "0.5.8"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c2dd04ddaf88237dc3b8d8f9a3c1004b506b54b3313403944054d23c0870c521"
+checksum = "a33c2bf77f2df06183c3aa30d1e96c0695a313d4f9c453cc3762a6db39f99200"
 dependencies = [
  "cfg-if",
  "crossbeam-utils",
@@ -958,7 +958,7 @@ dependencies = [
  "proc-macro2",
  "quote",
  "scratch",
- "syn",
+ "syn 1.0.107",
 ]
 
 [[package]]
@@ -975,7 +975,7 @@ checksum = "81bbeb29798b407ccd82a3324ade1a7286e0d29851475990b612670f6f5124d2"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn",
+ "syn 1.0.107",
 ]
 
 [[package]]
@@ -1027,7 +1027,7 @@ dependencies = [
  "proc-macro2",
  "quote",
  "strsim",
- "syn",
+ "syn 1.0.107",
 ]
 
 [[package]]
@@ -1038,7 +1038,7 @@ checksum = "9c972679f83bdf9c42bd905396b6c3588a843a17f0f16dfcfa3e2c5d57441835"
 dependencies = [
  "darling_core",
  "quote",
- "syn",
+ "syn 1.0.107",
 ]
 
 [[package]]
@@ -1061,7 +1061,7 @@ checksum = "fcc3dd5e9e9c0b295d6e1e4d811fb6f157d5ffd784b8d202fc62eac8035a770b"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn",
+ "syn 1.0.107",
 ]
 
 [[package]]
@@ -1186,7 +1186,7 @@ checksum = "558e40ea573c374cf53507fd240b7ee2f5477df7cfebdb97323ec61c719399c5"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn",
+ "syn 1.0.107",
 ]
 
 [[package]]
@@ -1403,14 +1403,14 @@ checksum = "2a4da76b3b6116d758c7ba93f7ec6a35d2e2cf24feda76c6e38a375f4d5c59f2"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn",
+ "syn 1.0.107",
 ]
 
 [[package]]
 name = "enumflags2"
-version = "0.7.5"
+version = "0.7.7"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "e75d4cd21b95383444831539909fbb14b9dc3fdceb2a6f5d36577329a1f55ccb"
+checksum = "c041f5090df68b32bcd905365fd51769c8b9d553fe87fde0b683534f10c01bd2"
 dependencies = [
  "enumflags2_derive",
  "serde",
@@ -1418,13 +1418,13 @@ dependencies = [
 
 [[package]]
 name = "enumflags2_derive"
-version = "0.7.4"
+version = "0.7.7"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f58dc3c5e468259f19f2d46304a6b28f1c3d034442e14b322d2b850e36f6d5ae"
+checksum = "5e9a1f9f7d83e59740248a6e14ecf93929ade55027844dfcea78beafccc15745"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn",
+ "syn 2.0.15",
 ]
 
 [[package]]
@@ -1435,7 +1435,7 @@ checksum = "e88bcb3a067a6555d577aba299e75eff9942da276e6506fc6274327daa026132"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn",
+ "syn 1.0.107",
 ]
 
 [[package]]
@@ -2387,7 +2387,7 @@ dependencies = [
  "proc-macro-crate",
  "proc-macro2",
  "quote",
- "syn",
+ "syn 1.0.107",
 ]
 
 [[package]]
@@ -2508,7 +2508,7 @@ dependencies = [
  "proc-macro-crate",
  "proc-macro2",
  "quote",
- "syn",
+ "syn 1.0.107",
 ]
 
 [[package]]
@@ -2812,9 +2812,9 @@ dependencies = [
 
 [[package]]
 name = "proc-macro2"
-version = "1.0.51"
+version = "1.0.56"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "5d727cae5b39d21da60fa540906919ad737832fe0b1c165da3a34d6548c849d6"
+checksum = "2b63bdb0cd06f1f4dedf69b254734f9b45af66e4a031e42a7480257d9898b435"
 dependencies = [
  "unicode-ident",
 ]
@@ -2874,9 +2874,9 @@ dependencies = [
 
 [[package]]
 name = "quote"
-version = "1.0.23"
+version = "1.0.26"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "8856d8364d252a14d474036ea1358d63c9e6965c8e5c1885c18f73d70bff9c7b"
+checksum = "4424af4bf778aae2051a77b60283332f386554255d722233d09fbfc7e30da2fc"
 dependencies = [
  "proc-macro2",
 ]
@@ -3221,7 +3221,7 @@ checksum = "af487d118eecd09402d70a5d72551860e788df87b464af30e5ea6a38c75c541e"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn",
+ "syn 1.0.107",
 ]
 
 [[package]]
@@ -3243,7 +3243,7 @@ checksum = "9a5ec9fa74a20ebbe5d9ac23dac1fc96ba0ecfe9f50f2843b52e537b10fbcb4e"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn",
+ "syn 1.0.107",
 ]
 
 [[package]]
@@ -3448,6 +3448,17 @@ dependencies = [
  "unicode-ident",
 ]
 
+[[package]]
+name = "syn"
+version = "2.0.15"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a34fcf3e8b60f57e6a14301a2e916d323af98b0ea63c599441eec8558660c822"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "unicode-ident",
+]
+
 [[package]]
 name = "syntect"
 version = "5.0.0"
@@ -3529,7 +3540,7 @@ checksum = "1fb327af4685e4d03fa8cbcf1716380da910eeb2bb8be417e7f9fd3fb164f36f"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn",
+ "syn 1.0.107",
 ]
 
 [[package]]
@@ -3675,7 +3686,7 @@ checksum = "4017f8f45139870ca7e672686113917c71c7a6e02d4924eda67186083c03081a"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn",
+ "syn 1.0.107",
 ]
 
 [[package]]
@@ -3955,7 +3966,7 @@ dependencies = [
  "once_cell",
  "proc-macro2",
  "quote",
- "syn",
+ "syn 1.0.107",
  "wasm-bindgen-shared",
 ]
 
@@ -3989,7 +4000,7 @@ checksum = "2aff81306fcac3c7515ad4e177f521b5c9a15f2b08f4e32d823066102f35a5f6"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn",
+ "syn 1.0.107",
  "wasm-bindgen-backend",
  "wasm-bindgen-shared",
 ]
@@ -4331,7 +4342,7 @@ checksum = "6ce87ca8e3417b02dc2a8a22769306658670ec92d78f1bd420d6310a67c245c6"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn",
+ "syn 1.0.107",
 ]
 
 [[package]]
@@ -4342,7 +4353,7 @@ checksum = "853f69a591ecd4f810d29f17e902d40e349fb05b0b11fff63b08b826bfe39c7f"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn",
+ "syn 1.0.107",
 ]
 
 [[package]]
@@ -4581,7 +4592,7 @@ dependencies = [
  "proc-macro2",
  "quote",
  "regex",
- "syn",
+ "syn 1.0.107",
 ]
 
 [[package]]
@@ -4648,5 +4659,5 @@ dependencies = [
  "proc-macro-crate",
  "proc-macro2",
  "quote",
- "syn",
+ "syn 1.0.107",
 ]