iOS lock step keyboard + metal

src/ast.zig

@@ -241,6 +241,9 @@ pub const VarDecl = struct {
     name: []const u8,
     type_annotation: ?*Node,
     value: ?*Node,
+    is_foreign: bool = false,
+    foreign_lib: ?[]const u8 = null,
+    foreign_name: ?[]const u8 = null,
 };
 
 pub const Assignment = struct {
@@ -506,6 +509,7 @@ pub const ProtocolDecl = struct {
     name: []const u8,
     methods: []const ProtocolMethodDecl,
     is_inline: bool = false, // #inline — embedded fn ptrs instead of vtable pointer
+    type_params: []const StructTypeParam = &.{}, // for `protocol(Target: Type) { ... }`
 };
 
 pub const ImplBlock = struct {
@@ -513,4 +517,6 @@ pub const ImplBlock = struct {
     target_type: []const u8,
     target_type_params: []const StructTypeParam = &.{}, // for `impl P for List($T)`
     methods: []const *Node, // fn_decl nodes
+    protocol_type_args: []const *Node = &.{}, // for `impl Into(Block) for Source` — type args on the protocol side
+    target_type_expr: ?*Node = null, // populated for parameterised-protocol impls; carries non-identifier source spellings (e.g. `Closure() -> void`)
 };