Macros for container literals with specific type.
extern crate maplit;
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The maplit crate uses => syntax to separate the key and value for the
mapping macros. (It was not possible to use : as separator due to syntactic
restrictions in regular macro_rules! macros.)
Note that rust macros are flexible in which brackets you use for the invocation.
You can use them as hashmap!{} or hashmap![] or hashmap!().
Generic container macros already exist elsewhere, so those are not provided here at the moment.