Delete more macro test remnants

.github/workflows/ci.yml

@@ -20,10 +20,6 @@ jobs:
       - uses: actions/checkout@v3
       - uses: dtolnay/rust-toolchain@nightly
       - run: cd test_suite && cargo test --features unstable
-      - uses: dtolnay/install@cargo-expand
-        if: github.event_name != 'pull_request'
-      - run: cd test_suite && cargo test --features expandtest --test expandtest -- --include-ignored
-        if: github.event_name != 'pull_request'
 
   windows:
     name: Test suite (windows)

test_suite/Cargo.toml

@@ -7,7 +7,6 @@ edition = "2018"
 publish = false
 
 [features]
-expandtest = []
 unstable = ["serde/unstable"]
 
 [dependencies]

test_suite/build.rs

@@ -1,27 +0,0 @@
-use std::process::{Command, ExitStatus, Stdio};
-
-fn has_cargo_expand() -> bool {
-    let cargo_expand = if cfg!(windows) {
-        "cargo-expand.exe"
-    } else {
-        "cargo-expand"
-    };
-
-    Command::new(cargo_expand)
-        .arg("--version")
-        .stdin(Stdio::null())
-        .stdout(Stdio::null())
-        .stderr(Stdio::null())
-        .status()
-        .as_ref()
-        .map(ExitStatus::success)
-        .unwrap_or(false)
-}
-
-fn main() {
-    println!("cargo:rerun-if-changed=build.rs");
-
-    if cfg!(feature = "expandtest") && has_cargo_expand() {
-        println!("cargo:rustc-cfg=expandtest");
-    }
-}