Actually, you're closer to the truth than Eliya is. The assignment is indeed conditional.
Aside from the syntax error from missing parens, the problems both yours and Eliya share are:
- 1 is actually evaluated before anything else,
- $x{a} is only evaluated once, and
- $x{a} is (only) evaluated in lvalue context.
See Re^2: &&= vivify keys?.
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