The name of NativeLib will be presented

compiler/rustc_session/src/cstore.rs

@@ -67,12 +67,11 @@ pub enum LinkagePreference {
 #[derive(Debug, Encodable, Decodable, HashStable_Generic)]
 pub struct NativeLib {
     pub kind: NativeLibKind,
-    pub name: Option<Symbol>,
+    pub name: Symbol,
     /// If packed_bundled_libs enabled, actual filename of library is stored.
     pub filename: Option<Symbol>,
     pub cfg: Option<ast::MetaItem>,
     pub foreign_module: Option<DefId>,
-    pub wasm_import_module: Option<Symbol>,
     pub verbatim: Option<bool>,
     pub dll_imports: Vec<DllImport>,
 }
@@ -81,6 +80,10 @@ impl NativeLib {
     pub fn has_modifiers(&self) -> bool {
         self.verbatim.is_some() || self.kind.has_modifiers()
     }
+
+    pub fn wasm_import_module(&self) -> Option<Symbol> {
+        if self.kind == NativeLibKind::WasmImportModule { Some(self.name) } else { None }
+    }
 }
 
 /// Different ways that the PE Format can decorate a symbol name.

compiler/rustc_session/src/utils.rs

@@ -37,6 +37,10 @@ pub enum NativeLibKind {
     /// Argument which is passed to linker, relative order with libraries and other arguments
     /// is preserved
     LinkArg,
+
+    /// Module imported from WebAssembly
+    WasmImportModule,
+
     /// The library kind wasn't specified, `Dylib` is currently used as a default.
     Unspecified,
 }
@@ -50,7 +54,10 @@ impl NativeLibKind {
             NativeLibKind::Dylib { as_needed } | NativeLibKind::Framework { as_needed } => {
                 as_needed.is_some()
             }
-            NativeLibKind::RawDylib | NativeLibKind::Unspecified | NativeLibKind::LinkArg => false,
+            NativeLibKind::RawDylib
+            | NativeLibKind::Unspecified
+            | NativeLibKind::LinkArg
+            | NativeLibKind::WasmImportModule => false,
         }
     }