rewrite test with #![no_core]

Author: StackOverflowExcept1on

tests/run-make/wasm-unexpected-features/foo.rs

@@ -0,0 +1,43 @@
+#![no_core]
+#![crate_type = "cdylib"]
+#![feature(no_core, lang_items, allocator_internals, rustc_attrs)]
+#![needs_allocator]
+#![allow(internal_features)]
+
+#[rustc_std_internal_symbol]
+unsafe fn __rust_alloc(_size: usize, _align: usize) -> *mut u8 {
+    0 as *mut u8
+}
+
+unsafe extern "Rust" {
+    #[rustc_std_internal_symbol]
+    fn __rust_alloc_error_handler(size: usize, align: usize) -> !;
+}
+
+#[used]
+static mut BUF: [u8; 1024] = [0; 1024];
+
+#[unsafe(no_mangle)]
+extern "C" fn init() {
+    unsafe {
+        __rust_alloc_error_handler(0, 0);
+    }
+}
+
+mod minicore {
+    #[lang = "pointee_sized"]
+    pub trait PointeeSized {}
+
+    #[lang = "meta_sized"]
+    pub trait MetaSized: PointeeSized {}
+
+    #[lang = "sized"]
+    pub trait Sized: MetaSized {}
+
+    #[lang = "copy"]
+    pub trait Copy {}
+    impl Copy for u8 {}
+
+    #[lang = "drop_in_place"]
+    fn drop_in_place<T>(_: *mut T) {}
+}

tests/run-make/wasm-unexpected-features/rmake.rs

@@ -2,31 +2,19 @@
 
 use std::path::Path;
 
-use run_make_support::{cargo, path, rfs, target, wasmparser};
+use run_make_support::{rfs, rustc, wasmparser};
 
 fn main() {
-    let target_dir = path("target");
-
-    cargo()
-        .args([
-            "rustc",
-            "--manifest-path",
-            "wasm32_test/Cargo.toml",
-            "--profile",
-            "release",
-            "--target",
-            "wasm32-wasip1",
-            "-Zbuild-std=core,alloc,panic_abort",
-            "--",
-            "-Clink-arg=--import-memory",
-            "-Clinker-plugin-lto=on",
-        ])
-        .env("RUSTFLAGS", "-Ctarget-cpu=mvp")
-        .env("CARGO_TARGET_DIR", &target_dir)
+    rustc()
+        .input("foo.rs")
+        .target("wasm32-wasip1")
+        .target_cpu("mvp")
+        .opt_level("z")
+        .lto("fat")
+        .linker_plugin_lto("on")
+        .link_arg("--import-memory")
         .run();
-
-    let wasm32_program_path = target_dir.join(target()).join("release").join("wasm32_program.wasm");
-    verify_features(&wasm32_program_path);
+    verify_features(Path::new("foo.wasm"));
 }
 
 fn verify_features(path: &Path) {