Validation: Multiple memories are not permitted for now

Author: kateinoigakukun

Sources/WasmKit/Module.swift

@@ -129,6 +129,8 @@ public struct Module {
     /// > Note:
     /// <https://webassembly.github.io/spec/core/exec/modules.html#instantiation>
     private func instantiateHandle(store: Store, imports: Imports) throws -> InternalInstance {
+        try ModuleValidator().validate(self)
+
         // Steps 5-8.
 
         // Step 9.

Sources/WasmKit/Validator.swift

@@ -24,3 +24,11 @@ struct InstructionValidator {
         }
     }
 }
+
+struct ModuleValidator {
+    func validate(_ module: Module) throws {
+        if module.memoryTypes.count > 1 {
+            throw ValidationError("Multiple memories are not permitted")
+        }
+    }
+}

Tests/WasmKitTests/SpectestTests.swift

@@ -22,7 +22,6 @@ final class SpectestTests: XCTestCase {
             path: Self.testPaths,
             include: [],
             exclude: [
-                "imports.wast",
                 "labels.wast",
                 "load.wast",
                 "local_get.wast",