Run the `Minimum Rust` CI job on Windows and fix Linux.

azure-pipelines.yml

@@ -2,12 +2,24 @@ trigger:
   - master
 
 jobs:
-  - job: min
-    displayName: Minimum Rust
+  - job: min_linux
+    pool:
+      vmImage: ubuntu-16.04
+    displayName: Minimum Rust (Linux)
+    variables:
+      TOOLCHAIN: 1.16.0
+    steps:
+      - template: ci/azure-install-rust.yml
+      - script: cargo build
+
+  - job: min_Windows
+    pool:
+      vmImage: vs2017-win2016
+    displayName: Minimum Rust (Windows)
+    variables:
+      TOOLCHAIN: 1.16.0
     steps:
       - template: ci/azure-install-rust.yml
-        parameters:
-          toolchain: 1.16.0
       - script: cargo build
 
   - job: Linux

ci/azure-install-rust.yml

@@ -11,8 +11,9 @@ steps:
     condition: ne( variables['Agent.OS'], 'Windows_NT' )
 
   - script: |
+      IF "%TOOLCHAIN%"=="" (SET TOOLCHAIN=stable-%TARGET%)
       curl -sSf -o rustup-init.exe https://win.rustup.rs
-      rustup-init.exe -y --default-toolchain stable-%TARGET%
+      rustup-init.exe -y --default-toolchain %TOOLCHAIN%
       echo ##vso[task.prependpath]%USERPROFILE%\.cargo\bin
     displayName: Install rust (windows)
     condition: eq( variables['Agent.OS'], 'Windows_NT' )