Proof-of-Concept for a new Try design

.editorconfig

@@ -0,0 +1,21 @@
+# EditorConfig helps developers define and maintain consistent
+# coding styles between different editors and IDEs
+# editorconfig.org
+
+root = true
+
+[*]
+end_of_line = lf
+charset = utf-8
+trim_trailing_whitespace = true
+insert_final_newline = true
+indent_style = space
+indent_size = 4
+
+[*.md]
+# double whitespace at end of line
+# denotes a line break in Markdown
+trim_trailing_whitespace = false
+
+[*.yml]
+indent_size = 2

.github/ISSUE_TEMPLATE/diagnostics.md

@@ -0,0 +1,46 @@
+---
+name: Diagnostic issue
+about: Create a bug report or feature request for a change to `rustc`'s error output
+labels: A-diagnostics, T-compiler
+---
+<!--
+Thank you for filing a bug report! 🐛 Please provide a short summary of the bug,
+along with any information you feel relevant to replicating the bug.
+
+If you cannot produce a minimal reproduction case (something that would work in
+isolation), please provide the steps or even link to a repository that causes
+the problematic output to occur. 
+-->
+
+Given the following code: <!-- Please provide a link to play.rust-lang.org -->
+
+```rust
+<code>
+```
+
+The current output is:
+
+```
+<rustc output>
+```
+
+<!-- The following is not always necessary. -->
+Ideally the output should look like:
+
+```
+<proposed output>
+```
+
+<!--
+If the problem is not self-explanatory, please provide a rationale for the
+change.
+-->
+
+<!--
+If dramatically different output is caused by small changes, consider also
+adding them here.
+
+If you're using the stable version of the compiler, you should also check if the
+bug also exists in the beta or nightly versions. The output might also be
+different depending on the Edition.
+-->

.github/workflows/ci.yml

@@ -349,6 +349,7 @@ jobs:
             env:
               SCRIPT: src/ci/docker/host-x86_64/x86_64-gnu-tools/checktools.sh x.py /tmp/toolstate/toolstates.json windows
               RUST_CONFIGURE_ARGS: "--build=x86_64-pc-windows-msvc --save-toolstates=/tmp/toolstate/toolstates.json"
+              DEPLOY_TOOLSTATES_JSON: toolstates-windows.json
             os: windows-latest-xl
           - name: i686-mingw-1
             env: