Fix spurious shadowing for higher-order implicits #2739
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If `x` had implicit function type, the previous algorithm did not realize that `x` and `x.apply(y)` were the same reference. Therefore, a spurious shadowing error occurred and the implicit search failed.
The previously failing test is ho-implicits.scala. Two more tests are for various other aspects of the implicit calculus work.
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If
xhad implicit function type, the previous algorithm did notrealize that
xandx.apply(y)were the same reference. Therefore,a spurious shadowing error occurred and the implicit search failed.