"Fix" the tool not working on Windows

src/main.rs

@@ -84,7 +84,16 @@ fn cargo_llvm_lines(filter_cargo: bool, sort_order: SortOrder) -> io::Result<i32
     let outdir = TempDir::new("cargo-llvm-lines").expect("failed to create tmp file");
     let outfile = outdir.path().join("crate");
 
-    run_cargo_rustc(outfile)?;
+    // There used to be just a `?` operator, but when running this tool on Windows,
+    // it was mysteriously failing on "System cannot find the file specified. (os error 2)",
+    // even though the original command succeeded and the output was written to the outfile.
+    // That's why we don't return early with `?` anymore, we just log the error instead
+    // and try to read the llvm-ir anyway.
+    // If some different error occurs, we will probably fail to
+    // read llvm-ir files later in `read_llvm_ir()` so we don't explicitly handle it here.
+    if let Err(e) = run_cargo_rustc(outfile) {
+        eprintln!("Something went wrong during compiler invocation:\n{}", e);
+    };
     let ir = read_llvm_ir(outdir)?;
     count_lines(ir, sort_order);