[Issue 18743] ConditionalExpression and AssignExpression should require parentheses

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=18743

--- Comment #2 from David Nadlinger <code at klickverbot.at> ---
(Note that this _is_ part of the specification in form of the grammar.
Assignment is defined as 

AssignExpression:
    ConditionalExpression
    ConditionalExpression = AssignExpression
    ConditionalExpression += AssignExpression
    ConditionalExpression -= AssignExpression
    ConditionalExpression *= AssignExpression
    ConditionalExpression /= AssignExpression
    ConditionalExpression %= AssignExpression
    ConditionalExpression &= AssignExpression
    ConditionalExpression |= AssignExpression
    ConditionalExpression ^= AssignExpression
    ConditionalExpression ~= AssignExpression
    ConditionalExpression <<= AssignExpression
    ConditionalExpression >>= AssignExpression
    ConditionalExpression >>>= AssignExpression
    ConditionalExpression ^^= AssignExpression

which unambiguously specifies the precedence.)

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