@strager After poking around a bit, it looks like there are a number of operators and other tokens that cause a syntax error when placed after -- and ++. Many of these are not properly reported by quick-lint-js. The following is what I've managed to find, though it is unlikely to be an exhaustive list.

Current quick-lint-js Output
Nothing

x++ (y);
x++ [y];
x++ .y;
x++ ?.y;

Current quick-lint-js Output
E0027: missing semicolon after statement

x++ new Type();
x++ ++y;
x++ --y;
x++ !y;  // Also reports E0261
x++ typeof y;
x++ void(y);
x++ delete(y);
x++ yield y;
x++ yield* y;

Current quick-lint-js Output
E0054: unexpected token

x++ ~y;
x++ : y;  // Also reports E0027
x++ ...y;

Current quick-lint-js Output
E0020: invalid expression left of assignment

x++ = y;
x++ += y;
x++ -= y;
x++ *= y;
x++ **= y;
x++ /= y;
x++ %= y;
x++ <<= y;
x++ >>= y;
x++ >>>= y;
x++ &= y;
x++ |= y;
x++ ^= y;
x++ &&= y;
x++ ||= y;

Current quick-lint-js Output
E0151: invalid function parameter

x++ => y;

The cases that report E0020, E0027, and E0151 make sense, while the rest probably need to be fixed.

Uh oh!

Uh oh!

error on 'x++.toString()' #1208

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