wasm shell + destructuring

src/parser.zig

@@ -2405,9 +2405,28 @@ pub const Parser = struct {
             try targets.append(self.allocator, target);
         }
 
-        // Only plain '=' is allowed
+        // Destructuring declaration: a, b := expr;
+        if (self.current.tag == .colon_equal) {
+            self.advance();
+            // All targets must be plain identifiers
+            var names = std.ArrayList([]const u8).empty;
+            for (targets.items) |target| {
+                if (target.data != .identifier) {
+                    return self.fail("destructuring targets must be identifiers");
+                }
+                try names.append(self.allocator, target.data.identifier.name);
+            }
+            const value = try self.parseExpr();
+            try self.expectSemicolonAfter(value);
+            return try self.createNode(start, .{ .destructure_decl = .{
+                .names = try names.toOwnedSlice(self.allocator),
+                .value = value,
+            } });
+        }
+
+        // Multi-target assignment: only plain '=' is allowed
         if (self.current.tag != .equal) {
-            return self.fail("multi-target assignment requires '='");
+            return self.fail("multi-target assignment requires '=' or ':='");
         }
         self.advance();