fix projects not compiling if compile tests fail

Author: ScanMountGoat

wgsl_to_wgpu/test_compile/Cargo.toml

@@ -11,3 +11,4 @@ half = { version = "2.7", features = ["bytemuck"] }
 nalgebra = "0.34"
 serde = { version = "1.0", features = ["derive"] }
 wgpu.workspace = true
+trybuild = "1.0"

wgsl_to_wgpu/test_compile/build.rs

@@ -2,15 +2,16 @@ use std::{ffi::OsStr, path::Path};
 
 const PATH: &str = "../src/snapshots";
 
-/// Create a file, which imports all snapshots in `PATH`.
 fn main() {
     println!("cargo:rerun-if-changed=build.rs");
     println!("cargo:rerun-if-changed={}", PATH);
 
+    // Create a file that imports all snapshots in `PATH`.
     let mut import_snapshots = String::new();
     for entry in std::fs::read_dir(PATH).unwrap() {
         let path = entry.unwrap().path().canonicalize().unwrap();
 
+        // TODO: prefer snapshot.new.rs if it exists
         if path.extension() != Some(OsStr::new("rs")) {
             continue;
         }

wgsl_to_wgpu/test_compile/src/compile_tests.rs

@@ -0,0 +1,5 @@
+#![allow(clippy::unnecessary_cast, nonstandard_style)]
+include!(concat!(env!("OUT_DIR"), "/import_snapshots.rs"));
+
+// trybuild requires a main function.
+fn main() {}

wgsl_to_wgpu/test_compile/src/lib.rs

@@ -1,2 +1,10 @@
-#![allow(clippy::unnecessary_cast, nonstandard_style)]
-include!(concat!(env!("OUT_DIR"), "/import_snapshots.rs"));
+#[test]
+fn test_compile() {
+    // Don't include the generated modules here directly.
+    // This allows projects to compile even with invalid generated code.
+    // TODO: this test failure skips other tests unless using --no-fail-fast
+    // TODO: generate a test.pass for each file instead?
+    // TODO: write file to OUT_DIR for each snapshot with a dummy main function.
+    let t = trybuild::TestCases::new();
+    t.pass("src/compile_tests.rs");
+}