grammar(P0): add peek expression, continue statement, and field type annotations acceptance; add sample apps and interpreter path\n\n- tokenizer: add keywords (peek, continue), tokens (=> as FatArrow, :: as DoubleColon), keep >> as Arrow\n- parser: implement peek as expression (literal patterns only, else required), add continue; accept field 'name: Type' (discard type P0)\n- interpreter: evaluate PeekExpr; add Continue control flow handling\n- apps: add peek-demo, loop-continue-demo, adjust field-decl demo; use ConsoleBox instead of env.console for interpreter backend\n- docs: CURRENT_TASK updated earlier for Phase 12.7 P0\n\nNOTE: peek arms currently single-expression (no block expr yet); VM/MIR path does not lower PeekExpr yet; use --backend interpreter for demos

src/parser/declarations/box_definition.rs

@@ -482,8 +482,16 @@ impl NyashParser {
                     
                     methods.insert(field_or_method, method);
                 } else {
-                    // フィールド定義
-                    fields.push(field_or_method);
+                    // フィールド定義（P0: 型注釈 name: Type を受理して破棄）
+                    let fname = field_or_method;
+                    if self.match_token(&TokenType::COLON) {
+                        self.advance(); // consume ':'
+                        // 型名（識別子）を許可（P0は保持せず破棄）
+                        if let TokenType::IDENTIFIER(_ty) = &self.current_token().token_type {
+                            self.advance();
+                        }
+                    }
+                    fields.push(fname);
                 }
             } else {
                 return Err(ParseError::UnexpectedToken {