Misleading error message for isz -> sz

```c3 fn void skipForm(char** ptr, char form, char addressSize, ushort version) { switch (form) { case DW_FORM_ADDR: *ptr += addressSize; case DW_FORM_BLOCK1: char len = **ptr; (*ptr)++; *ptr += len; case DW_FORM_BLOCK2: ushort len = read_u16_le(*ptr); *ptr += (isz)2 + len; // error shows '2' as error, but its actually any character after ')' case DW_FORM_BLOCK4: uint len = read_u32_le(*ptr); *ptr += (isz)4 + len; // no error, analysis ends after above error ``` Due to the isz -> sz change, I get the following error: ``` 355: *ptr += len; 356: case DW_FORM_BLOCK2: 357: ushort len = read_u16_le(*ptr); 358: *ptr += (isz)len + 2; ^ (/home/mkp/src/osdev3/kernel/debug.c3:358:26) Error: Expected ';' ``` This is plenty misleading, as isz doesn't exist. Probably best to improve the error message with an error during semantic analysis, as isz could be technically a name now. Something like 'isz is not a recognized type cast' or something.