feat: for..in 范围语法 .. 改为 to 关键字

src/lexer/lexer.c

@@ -58,6 +58,7 @@ static TokenKind check_keyword(const Token* tok) {
     KW("mut",    TOK_MUT);
     KW("if",     TOK_IF);     KW("else",   TOK_ELSE);
     KW("while",  TOK_WHILE);  KW("for",    TOK_FOR);  KW("in",     TOK_IN);
+    KW("to",     TOK_TO);
 	    KW("return", TOK_RETURN);
     KW("i64",    TOK_I64);    KW("f64",    TOK_F64);
     KW("bool",   TOK_BOOL);   KW("str",    TOK_STR);
@@ -137,7 +138,6 @@ Token* lex(Arena* a, const char* source, const char* filename,
         else if (c == '>') { tokens[idx++] = make_token(&l, TOK_GT, l.pos, 1); advance(&l); }
         else if (c == '&' && peek_next(&l) == '&') { tokens[idx++] = make_token(&l, TOK_AND_AND, l.pos, 2); advance(&l); advance(&l); }
         else if (c == '|' && peek_next(&l) == '|') { tokens[idx++] = make_token(&l, TOK_PIPE_PIPE, l.pos, 2); advance(&l); advance(&l); }
-        else if (c == '.' && peek_next(&l) == '.') { tokens[idx++] = make_token(&l, TOK_DOT_DOT, l.pos, 2); advance(&l); advance(&l); }
         else if (c == '.') { tokens[idx++] = make_token(&l, TOK_DOT, l.pos, 1); advance(&l); }
         else if (c == '[') { tokens[idx++] = make_token(&l, TOK_LBRACKET, l.pos, 1); advance(&l); }
         else if (c == ']') { tokens[idx++] = make_token(&l, TOK_RBRACKET, l.pos, 1); advance(&l); }