sizeof without parentheses refuses a call followed by [i] or ->

int g[3] = {1, 2, 3};
int *f(void) { return g; }
struct S { int a[5]; } s;
struct S *h(void) { return &s; }
int main(void) { return (int)(sizeof f()[1] + sizeof h()->a); }   /* gcc: 24 */

pxx: pascal26:4: error: expected ')' near: sizeof f >>>. Each of the two operands fails alone; sizeof f() and sizeof *f() compile, and so does the parenthesised sizeof(f()[1]). Measured 2026-09-27 on HEAD (compiler 848d33f2668a). A refusal, so no program gets a wrong answer; the postfix chain after a call inside the sizeof unary operand is what is not parsed.