Fix the CI?

.github/workflows/test.yml

@@ -17,14 +17,14 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        rust_toolchain: [nightly, stable, 1.38.0]
+        rust_toolchain: [nightly, stable, 1.56.0]
         os: [ubuntu-latest, windows-latest, macOS-latest]
         mode: ['--release', '-Zminimal-versions', '']
         manifest: ['psm/Cargo.toml', 'Cargo.toml']
         exclude:
           - rust_toolchain: stable
             mode: -Zminimal-versions
-          - rust_toolchain: 1.38.0
+          - rust_toolchain: 1.56.0
             mode: -Zminimal-versions
     timeout-minutes: 10
     steps:

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "stacker"
-version = "0.1.15"
+version = "0.1.16"
 authors = ["Alex Crichton <[email protected]>", "Simonas Kazlauskas <[email protected]>"]
 build = "build.rs"
 license = "MIT OR Apache-2.0"

psm/build.rs

@@ -7,6 +7,7 @@ fn find_assembly(
     env: &str,
     masm: bool,
 ) -> Option<(&'static str, bool)> {
+    println!("cargo::rustc-check-cfg=cfg(switchable_stack,asm)");
     match (arch, endian, os, env) {
         // The implementations for stack switching exist, but, officially, doing so without Fibers
         // is not supported in Windows. For x86_64 the implementation actually works locally,