don't set MSRV and only run doctests on nightly

We have too many dependencies to actually guarantee our MSRV.

We only run doctests on nightly so we don't have to generalize
doctests for slightly different line numbers across different Rust
versions. Our integration tests do generalize in this way, so we
still run those on both stable and nightly.

.github/workflows/ci.yml

@@ -43,15 +43,15 @@ env:
   # `CRATE_NIGHTLY_XXX` are flags that we add to `XXX` only on the nightly
   # toolchain.
   CRATE_NIGHTLY_RUSTFLAGS: -Zrandomize-layout
-  CRATE_NIGHTLY_MIRIFLAGS: "-Zmiri-disable-isolation -Zmiri-symbolic-alignment-check"
+  CRATE_NIGHTLY_MIRIFLAGS: "-Zmiri-disable-isolation"
 
 jobs:
   build_test:
     runs-on: ubuntu-latest
 
     strategy:
       matrix:
-        toolchain: [ "msrv", "stable", "nightly" ]
+        toolchain: [ "stable", "nightly" ]
         target: [ "i686-unknown-linux-gnu", "x86_64-unknown-linux-gnu" ]
 
     name: Build & Test (toolchain:${{ matrix.toolchain }}, target:${{ matrix.target }})
@@ -138,23 +138,27 @@ jobs:
 
     - name: Check lib
       run: cargo +${{ env.CRATE_TOOLCHAIN }} check --target ${{ matrix.target }} --lib --verbose
-      if: ${{ matrix.toolchain == 'msrv' }}
 
     - name: Check extras
       run: cargo +${{ env.CRATE_TOOLCHAIN }} check --target ${{ matrix.target }} --all-targets --verbose
-      if: ${{ matrix.toolchain != 'msrv' }}
 
-    - name: Test
-      run: cargo +${{ env.CRATE_TOOLCHAIN }} test --target ${{ matrix.target }} --verbose
+    - name: Test (doc)
+      run: cargo +${{ env.CRATE_TOOLCHAIN }} test --target ${{ matrix.target }} --verbose --doc
       # Only run tests when targetting x86 (32- or 64-bit) - we're executing on
       # x86_64, so we can't run tests for any non-x86 target.
-      if: ${{ matrix.toolchain != 'msrv' && (contains(matrix.target, 'x86_64') || contains(matrix.target, 'i686')) }}
+      if: ${{ matrix.toolchain == 'nightly' && (contains(matrix.target, 'x86_64') || contains(matrix.target, 'i686')) }}
+
+    - name: Test (integration)
+      run: cargo +${{ env.CRATE_TOOLCHAIN }} test --target ${{ matrix.target }} --verbose --tests
+      # Only run tests when targetting x86 (32- or 64-bit) - we're executing on
+      # x86_64, so we can't run tests for any non-x86 target.
+      if: ${{ (contains(matrix.target, 'x86_64') || contains(matrix.target, 'i686')) }}
 
     - name: Test (loom)
       run: cargo +${{ env.CRATE_TOOLCHAIN }} test --target ${{ matrix.target }} --verbose --release --tests
       # Only run tests when targetting x86 (32- or 64-bit) - we're executing on
       # x86_64, so we can't run tests for any non-x86 target.
-      if: ${{ matrix.toolchain != 'msrv' && (contains(matrix.target, 'x86_64') || contains(matrix.target, 'aarch64')) }}
+      if: ${{ (contains(matrix.target, 'x86_64') || contains(matrix.target, 'aarch64')) }}
       env:
         RUSTFLAGS: --cfg loom ${{ env.RUSTFLAGS }}
 
@@ -198,19 +202,6 @@ jobs:
           set -e
           cargo clippy --all-targets
 
-  check_msrv:
-    runs-on: ubuntu-latest
-    name: Check MSRVs match
-    steps:
-      - uses: actions/checkout@v3
-      - name: Rust Cache
-        uses: Swatinem/[email protected]
-      - uses: extractions/setup-just@v1
-      # Make sure that the MSRV in async-backtrace's and async-backtrace-attributes's
-      # `Cargo.toml` files are the same.
-      - name: Check MSRVs match
-        run: just check-msrv
-
   check_readme:
     runs-on: ubuntu-latest
     name: Check README is correctly generated.
@@ -219,7 +210,7 @@ jobs:
       - name: Rust Cache
         uses: Swatinem/[email protected]
       - uses: extractions/setup-just@v1
-      - name: Check MSRVs match
+      - name: Check README matches
         run: |
           set -e
           cargo install cargo-readme --version 3.2.0
@@ -233,7 +224,6 @@ jobs:
       - build_test
       - check_fmt
       - check_clippy
-      - check_msrv
       - check_readme
     runs-on: ubuntu-latest
     steps:

attributes/Cargo.toml

@@ -3,7 +3,6 @@ name = "async-backtrace-attributes"
 version = "0.2.6"
 edition = "2018"
 license = "MIT"
-rust-version = "1.59"
 description = "Procedural macros for the `async-backtrace` crate."
 repository = "https://github.com/tokio-rs/async-backtrace"
 

backtrace/Cargo.toml

@@ -4,7 +4,6 @@ version = "0.2.6"
 edition = "2018"
 license = "MIT"
 readme = "../README.md"
-rust-version = "1.59"
 description = "Efficient, logical 'backtraces' of async tasks."
 repository = "https://github.com/tokio-rs/async-backtrace"
 categories = ["asynchronous", "development-tools::debugging"]

backtrace/src/frame.rs

@@ -364,7 +364,7 @@ impl Frame {
     }
 
     /// Produces an iterator over this frame's ancestors.
-    pub fn backtrace(&self) -> impl Iterator<Item = &Frame> + FusedIterator {
+    pub fn backtrace(&self) -> impl FusedIterator<Item = &Frame> {
         /// An iterator that traverses up the tree of [`Frame`]s from a leaf.
         #[derive(Clone)]
         pub(crate) struct Backtrace<'a> {
@@ -399,7 +399,7 @@ impl Frame {
     /// The caller must ensure that the corresponding Kind::Root{mutex} is
     /// locked.  The caller must also ensure that the returned iterator is
     /// dropped before the mutex is dropped.
-    pub(crate) unsafe fn subframes(&self) -> impl Iterator<Item = &Frame> + FusedIterator {
+    pub(crate) unsafe fn subframes(&self) -> impl FusedIterator<Item = &Frame> {
         pub(crate) struct Subframes<'a> {
             iter: linked_list::Iter<'a, Frame>,
         }

backtrace/src/location.rs

@@ -9,15 +9,14 @@ use futures::Future;
 ///
 /// #[tokio::main]
 /// async fn main() {
-/// #   macro_rules! assert_eq { ($l:expr, $r:expr) => { debug_assert_eq!($l.len(), $r.len()); } }
-///     assert_eq!(location!().to_string(), "rust_out::main::{{closure}} at src/location.rs:8:16");
+///     assert_eq!(location!().to_string(), "rust_out::main::{{closure}} at backtrace/src/location.rs:8:16");
 ///
 ///     async {
-///         assert_eq!(location!().to_string(), "rust_out::main::{{closure}}::{{closure}} at src/location.rs:11:20");
+///         assert_eq!(location!().to_string(), "rust_out::main::{{closure}}::{{closure}} at backtrace/src/location.rs:11:20");
 ///     }.await;
 ///     
 ///     (|| async {
-///         assert_eq!(location!().to_string(), "rust_out::main::{{closure}}::{{closure}}::{{closure}} at src/location.rs:15:20");
+///         assert_eq!(location!().to_string(), "rust_out::main::{{closure}}::{{closure}}::{{closure}} at backtrace/src/location.rs:15:20");
 ///     })().await;
 /// }
 /// ```