Create {And,Or}TypeTree in Parsers, not desugar #4424
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The new API is required for all use cases in this PR.
Fix scala#4373. The testcase is from examples in scala#4373, variations and tests for types with wildcards. I'm unsure for a couple cases.
Without this commit, the testcase produces additional spurious errors: ```scala -- [E104] Syntax Error: tests/neg/i4373.scala:10:0 ----------------------------- 10 |class A2 extends _ with _ // error // error |^ |class Any is not a trait longer explanation available when compiling with `-explain` -- [E104] Syntax Error: tests/neg/i4373.scala:11:21 ---------------------------- 11 |class A3 extends Base with _ // error | ^ | class Any is not a trait longer explanation available when compiling with `-explain` -- Error: tests/neg/i4373.scala:12:24 ------------------------------------------ 12 |class A4 extends _ with Base // error | ^^^^ |illegal trait inheritance: superclass Any does not derive from trait Base's superclass Object ``` These errors make absolutely no sense for a user, since they refer to code the user didn't write, but that was generated by the compiler's error correction mechanism. I haven't checked if we could use `Ident(nme.ERROR)` everywhere. I have also tried using `EmptyTree` and `EmptyTree.withPos(wildcardPos)` and `EmptyTree.clone.withPos(wildcardPos)` as fallback trees, but all of them failed in some way.
TODO: make checkWildcard private to Parsers again.
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odersky
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May 1, 2018
odersky
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May 1, 2018
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Essentially reviewed in scala#4424.
Blaisorblade
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Essentially reviewed in scala#4424.
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Essentially reviewed in scala#4424.
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Refactoring on top of #4422, suggested by @smarter, WIP.
checkWildcardprivate to Parsers again.