See if this gets the build fixed

appveyor.yml

@@ -130,4 +130,12 @@ build: false
 #directly or perform other testing commands. Rust will automatically be placed in the PATH
 # environment variable.
 test_script:
-  - cargo test --verbose %cargoflags%
+  - cargo test --verbose --features strum_tests/test_phf %cargoflags%
+
+for:
+- matrix:
+    only:
+      - channel: 1.32.0
+
+  test_script:
+  - cargo test --verbose %cargoflags%

strum_tests/Cargo.toml

@@ -5,7 +5,7 @@ edition = "2018"
 authors = ["Peter Glotfelty <peglotfe@microsoft.com>"]
 
 [features]
-default = ["test_phf"]
+default = []
 test_phf = ["strum/phf"]
 
 [dependencies]