shell/math: improve comments
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| @@ -856,9 +856,11 @@ evaluate_string(arith_state_t *math_state, const char *expr) | |
| */ | |
| prec = PREC(op); | |
| if (prec != PREC_LPAREN && prec < UNARYPREC) { | |
| - | /* binary, ternary or RPAREN */ |
| + | /* Binary, ternary or RPAREN */ |
| if (lasttok != TOK_VALUE) { | |
| - | /* must be preceded by a num (example?) */ |
| + | /* Must be preceded by a value. |
| + | * $((2 2 + * 3)) would be accepted without this. |
| + | */ |
| goto syntax_err; | |
| } | |
| /* if op is RPAREN: | |