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[BUG] Cannot initialize a std::unordered_map with literals #1343

Description

@threeifbyair

Describe the bug
There is no way to use literals to initialize a std::unordered_map. The parentheses are not translated into braces and hence are treated as a pair of comma-separated values by C++1, ignoring the first value.

To Reproduce
bar : std::unordered_map<int, std::string> = ( ( 42, "hello" ), ( 43, "world" ) );

translates to

std::unordered_map<int,std::string> bar {(42, "hello"), (43, "world")};

https://cpp2.godbolt.org/z/Gqh9brrdE (this includes some more cases)

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