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In order to handle unquoting quasiquotes needs to know if type is
iterable and whats the depth of the iterable nesting which is called
rank. (e.g. List[List[Tree]] is rank 2 iterable of Tree)
The logic that checks depth of iterable nesting didn't take a situation
where T is in fact Iterable[T] which caused infinite recursion in
stripIterable function.
In order to fix it stripIterable now always recurs no more than
non-optional limit times.
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1. Rename cardinality into rank. Shorter word, easier to
understand, more appropriate in our context.
2. Previously we called any dollar substitution splicing
but this is not consistent with Scheme where splicing
is substitution with non-zero rank.
So now $foo is unquoting and ..$foo and ...$foo is
unquote splicing or just splicing. Correspondingly
splicee becomes unquotee.
3. Rename si7980 test into t7980
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On one hand we know that q"($expr)" is the same as q"$expr". On the
other if we wrap it into a list and splice as q"(..$expr)" we get a
Tuple1 constructor call which is inconsistent.
This pull request fixes this inconsistency by making q"(..$expr)" being
equivalent q"(${expr.head})" for single-element list.
We also add support for matching of expressions as single-element tuples
(similarly to blocks) and remove liftables and unliftables for Tuple1
(which aren't clearly defined any longer due to q"(foo)" == q"foo"
invariant).
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Unliftable is a type class similar to existing Liftable that lets
users to extract custom data types out of trees with the help of
straightforward type ascription syntax:
val q“foo.bar(${baz: Baz})” = ...
This will use Unliftable[Baz] to extract custom data type Baz out of
a tree nested inside of the another tree. A simpler example would be
extracting of constant values:
val q”${x: Int} + ${y: Int}” = q”1 + 2”
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