add rough char/str parsing

twasm/asm/tests.asm

@@ -368,6 +368,23 @@ test_evaluate_constant:
   cmp rdx, 0x02
   jne .fail
 
+  ; char
+  mov rdi, .case0c
+  mov rsi, 3
+  call evaluate_constant
+  cmp rax, [.case0c_solution]
+  jne .fail
+  cmp rdx, 0x03
+  jne .fail
+
+  ; str
+  mov rdi, .case0s
+  mov rsi, 5
+  call evaluate_constant
+  cmp rax, [.case0s_solution]
+  jne .fail
+  cmp rdx, 0x04
+
   .pass:
     mov rsi, msg_pass
     call print
@@ -385,6 +402,10 @@ test_evaluate_constant:
   .case2h_solution dq 0x1234567890
   .case3h db "0x243F6A8885A308D3"
   .case3h_solution dq 0x243F6A8885A308D3
+  .case0c db "' '"
+  .case0c_solution dq ' '
+  .case0s db '"str"'
+  .case0s_solution dq "str"
 
   .case0q db "0q31103755242102"
   .case0q_solution dq 0q31103755242102