Yukang/remove type ascription

.git-blame-ignore-revs

@@ -1,3 +1,5 @@
+# Use `git config blame.ignorerevsfile .git-blame-ignore-revs` to make `git blame` ignore the following commits.
+
 # format the world
 a06baa56b95674fc626b3c3fd680d6a65357fe60
 # format libcore

.github/ISSUE_TEMPLATE/diagnostics.yaml

@@ -0,0 +1,65 @@
+name: Diagnostic issue
+description: Create a bug report or feature request for a change to `rustc`'s error output
+labels: ["A-diagnostics", "T-compiler"]
+body:
+  - type: markdown
+    attributes:
+      value: |
+        Thank you for filing a diagnostics 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.
+  - type: textarea
+    id: code
+    attributes:
+      label: Code
+      description: Please provide code that can reproduce the problem
+      placeholder: code
+      render: Rust
+    validations:
+      required: true
+  - type: textarea
+    id: output
+    attributes:
+      label: Current output
+      description: Please provide the `rustc` output you see
+      placeholder: rustc output
+      render: Shell
+    validations:
+      required: true
+  - type: textarea
+    id: desired-output
+    attributes:
+      label: Desired output
+      description: Please provide what the output *should* be
+      placeholder: proposed output
+      render: Shell
+    validations:
+      required: false
+  - type: textarea
+    id: rationale
+    attributes:
+      label: Rationale and extra context
+      description: If the problem is not self-explanatory, please provide a rationale for the change.
+    validations:
+      required: false
+  - type: textarea
+    id: other-output
+    attributes:
+      label: Other cases
+      description: If dramatically different output is caused by small changes, consider also adding them here.
+      render: Rust
+    validations:
+      required: false
+  - type: markdown
+    attributes:
+      value: |
+        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.
+  - type: textarea
+    id: extra
+    attributes:
+      label: Anything else?
+      description: If you have more details you want to give us to reproduce this issue, please add it here
+    validations:
+      required: false

.github/ISSUE_TEMPLATE/documentation.yaml

@@ -0,0 +1,38 @@
+name: Documentation problem
+description: Create a report for a documentation problem.
+labels: ["A-docs"]
+body:
+  - type: markdown
+    attributes:
+      value: |
+        Thank you for finding a documentation problem! 📚
+
+        Documentation problems might be grammatical issues, typos, or unclear wording, please provide details regarding the documentation including where it is present.
+
+        Note: If your issue is for one of these, please use their dedicated issue tracker instead:
+        - [The Rust Book](https://github.com/rust-lang/book/issues)
+        - [Rust by Example](https://github.com/rust-lang/rust-by-example/issues)
+        - [The Edition Guide](https://github.com/rust-lang/edition-guide/issues)
+        - [The Cargo Book](https://github.com/rust-lang/cargo/issues)
+        - [The Clippy Book](https://github.com/rust-lang/rust-clippy/issues)
+        - [The Reference](https://github.com/rust-lang/reference/issues)
+        - [The Rustonomicon](https://github.com/rust-lang/nomicon/issues)
+        - [The Embedded Book](https://github.com/rust-embedded/book/issues)
+
+        All other documentation issues should be filed here.
+
+        Or, if you find an issue related to rustdoc (e.g. doctest, rustdoc UI), please use the bug report or blank issue template instead.
+
+  - type: textarea
+    id: location
+    attributes:
+      label: Location
+    validations:
+      required: true 
+
+  - type: textarea
+    id: summary
+    attributes:
+      label: Summary
+    validations:
+      required: true 

.github/ISSUE_TEMPLATE/ice.md

@@ -7,9 +7,7 @@ labels: C-bug, I-ICE, T-compiler
 Thank you for finding an Internal Compiler Error! 🧊  If possible, try to provide
 a minimal verifiable example. You can read "Rust Bug Minimization Patterns" for
 how to create smaller examples.
-
 http://blog.pnkfx.org/blog/2019/11/18/rust-bug-minimization-patterns/
-
 -->
 
 ### Code
@@ -49,4 +47,3 @@ environment. E.g. `RUST_BACKTRACE=1 cargo build`.
 
 </p>
 </details>
-

.github/ISSUE_TEMPLATE/ice.yaml

@@ -0,0 +1,82 @@
+name: Internal Compiler Error (for use by automated tooling)
+description: For now, you'll want to use the other ICE template, as GitHub forms have strict limits on the size of fields so backtraces cannot be pasted directly.
+labels: ["C-bug", "I-ICE", "T-compiler"]
+title: "[ICE]: "
+body:
+  - type: markdown
+    attributes:
+      value: |
+        Thank you for finding an Internal Compiler Error! 🧊
+
+        If possible, try to provide a minimal verifiable example.
+
+        You can read "[Rust Bug Minimization Patterns](http://blog.pnkfx.org/blog/2019/11/18/rust-bug-minimization-patterns/)" for how to create smaller examples.
+
+  - type: textarea
+    id: code
+    attributes:
+      label: Code
+      description: Please provide code or a link to a repository that can reproduce the problem
+      placeholder: code
+      render: Rust
+    validations:
+      required: false
+
+  - type: checkboxes
+    attributes:
+      label: Affected release channels
+      description: 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
+      options:
+        - label: Previous Stable
+          required: false
+        - label: Current Stable
+          required: false
+        - label: Current Beta
+          required: false
+        - label: Current Nightly
+          required: false
+
+  - type: textarea
+    id: version
+    attributes:
+      label: Rust Version
+      description: Please provide the `rustc` version, `rustc --version --verbose`
+      placeholder: |
+        $ rustc --version --verbose
+        rustc 1.XX.Y (SHORTHASH DATE)
+        binary: rustc
+        commit-hash: LONGHASHVALUE
+        commit-date: DATE
+        host: PLATFORMTRIPLE
+        release: 1.XX.Y
+        LLVM version: XX.YY.ZZ
+      render: Shell
+    validations:
+      required: true
+
+  - type: textarea
+    id: output
+    attributes:
+      label: Current error output
+      description: Please provide the `rustc` output you see
+      placeholder: output
+      render: Shell
+    validations:
+      required: false
+
+  - type: textarea
+    id: backtrace
+    attributes:
+      label: Backtrace
+      description: Include a backtrace in the code block by setting `RUST_BACKTRACE=full` in your environment, e.g. `RUST_BACKTRACE=full cargo build`
+      render: Shell
+    validations:
+      required: true
+
+  - type: textarea
+    id: extra
+    attributes:
+      label: Anything else?
+      description: If you have more details you want to give us to reproduce this issue, please add it here
+    validations:
+      required: false