Make verbose rustc version information available

* commit-hash: rustc's source revision long commit hash
* abbrev-hash: rustc's source revision short commit hash
* commit-date: rustc's source revision commit date
* release: rustc's version

The earliest compatible rustc release is 1.16.0 (2017-03-10). Earlier
versions did not implement `--verbose --version`s.

.github/workflows/ci.yml

@@ -8,12 +8,13 @@ on:
 
 jobs:
   install:
-    name: Rust ${{matrix.rust}}
-    runs-on: ubuntu-latest
+    name: Rust ${{matrix.rust}} on ${{matrix.os}}
+    runs-on: ${{matrix.os}}
     strategy:
       fail-fast: false
       matrix:
-        rust: [nightly, beta, stable]
+        rust: [nightly, beta, stable, "1.16"]
+        os: [ubuntu-latest, windows-latest, macos-latest]
     steps:
       - uses: actions/checkout@v3
       - uses: ./
@@ -23,4 +24,12 @@ jobs:
           toolchain: ${{matrix.rust}}
       - name: Check ${{'${{steps.toolchain.outputs.version}}'}}
         run: echo '${{steps.toolchain.outputs.version}}'
-      - run: rustc --version
+      - name: Check ${{'${{steps.toolchain.outputs.commit-hash}}'}}
+        run: echo '${{steps.toolchain.outputs.commit-hash}}'
+      - name: Check ${{'${{steps.toolchain.outputs.abbrev-hash}}'}}
+        run: echo '${{steps.toolchain.outputs.abbrev-hash}}'
+      - name: Check ${{'${{steps.toolchain.outputs.commit-date}}'}}
+        run: echo '${{steps.toolchain.outputs.commit-date}}'
+      - name: Check ${{'${{steps.toolchain.outputs.release}}'}}
+        run: echo '${{steps.toolchain.outputs.release}}'
+      - run: rustc --verbose --version