More buildins and vscode exstention <CO-AUthored, ai>

vm/types.v

@@ -12,14 +12,20 @@ mut:
 	val  i64
 }
 
+// StructVal is a struct (or map) value. `fields` keeps insertion order for
+// rendering and JSON encoding; `by_name` is a hash index for O(1) field
+// lookup by name, so map-style access on large records stays fast.
 struct StructVal {
 mut:
-	fields []Field
+	fields  []Field
+	by_name map[string]int // field name -> index into fields
 }
 
 // Handler records a try/catch handler pushed at runtime.
 struct Closure {
 	entry int // code IP of the function body
+mut:
+	captured []i64 // values of the enclosing locals this closure captures (by value)
 }
 
 struct Handler {
@@ -30,26 +36,27 @@ struct Handler {
 
 struct Vm {
 mut:
-	code      []u8
-	strings   []string
-	arrays    [][]i64
-	structs   []StructVal
-	floats    []f64
-	closures  []Closure
-	stack     []i64
-	sp        int
-	bp        int
-	ip        int
-	trace     bool
-	halted    bool
-	prog_args []string
-	exit_code i64
-	did_exit  bool
-	handlers  []Handler
-	lines     []obj.LineInfo // debug info: code offset -> source line
-	const_strs int          // strings[0..const_strs] are bytecode constants, never collected
-	last_heap  int          // heap size at the last GC check (allocation trigger)
-	build_root string       // directory of the .vrmm build module (build_root() builtin)
+	code       []u8
+	strings    []string
+	arrays     [][]i64
+	structs    []StructVal
+	floats     []f64
+	closures   []Closure
+	stack      []i64
+	sp         int
+	bp         int
+	ip         int
+	trace      bool
+	halted     bool
+	prog_args  []string
+	exit_code  i64
+	did_exit   bool
+	handlers   []Handler
+	lines      []obj.LineInfo // debug info: code offset -> source line
+	fns        []obj.BinFn    // function table (for stack traces)
+	const_strs int            // strings[0..const_strs] are bytecode constants, never collected
+	last_heap  int            // heap size at the last GC check (allocation trigger)
+	build_root string         // directory of the .vrmm build module (build_root() builtin)
 }
 
 fn bool_i64(b bool) i64 {