don't run tests for MSRV (they use new fancy shit)

.github/workflows/rust.yml

@@ -86,10 +86,6 @@ jobs:
             os: ubuntu-latest
             rust: stable
             target: riscv64gc-unknown-linux-gnu
-          # msrv
-          - build: msrv
-            os: ubuntu-latest
-            rust: 1.34.2
 
     steps:
       - uses: actions/checkout@v2
@@ -115,6 +111,20 @@ jobs:
       - name: Test
         run: ${{ env.CARGO }} test --verbose ${{ env.TARGET }}
 
+  check-msrv:
+    name: MSRV
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - name: Install Rust
+        uses: actions-rs/toolchain@v1
+        with:
+          toolchain: 1.34.2
+          profile: minimal
+          override: true
+      - name: Cargo check
+        run: cargo check --verbose
+
   miri:
     name: Miri
     runs-on: ubuntu-latest