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author | Paul Phillips <paulp@improving.org> | 2010-10-27 21:08:48 +0000 |
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committer | Paul Phillips <paulp@improving.org> | 2010-10-27 21:08:48 +0000 |
commit | 683af5895e3dead6a6dac3c9939a7bcd2c7bad18 (patch) | |
tree | 21eb75593208fb124c29393b680044616c8ccfde /test/files/pos/bug2693.scala | |
parent | ba6fbcef841743e5e8690a7be8f86148a9513557 (diff) | |
download | scala-683af5895e3dead6a6dac3c9939a7bcd2c7bad18.tar.gz scala-683af5895e3dead6a6dac3c9939a7bcd2c7bad18.tar.bz2 scala-683af5895e3dead6a6dac3c9939a7bcd2c7bad18.zip |
A double goodness whammy involving type inferen...
A double goodness whammy involving type inference at the borders.
1) Implicit search preserves singleton type fidelity. 2) Unification of
parent bounds is (closer to) correct.
Result of 1: "implicit def f(x: Foo.type)" will convert object Foo.
Result of 2: "new Trait[Int] { }" may enjoy its type constructor being
inferred, no longer foiled by the anonymous class.
Also included are some clarity-enhnancing renamings and refactorings.
Performance note: I heavily benchmarked the change to isSubArgs and it
is reproducibly faster than the previous implementation. Numbers and
methodology available upon request.
Closes #2693, #3964. Review by moors, who wrote most of this patch but
might like to review the comments.
Diffstat (limited to 'test/files/pos/bug2693.scala')
-rw-r--r-- | test/files/pos/bug2693.scala | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/test/files/pos/bug2693.scala b/test/files/pos/bug2693.scala new file mode 100644 index 0000000000..97732cf081 --- /dev/null +++ b/test/files/pos/bug2693.scala @@ -0,0 +1,6 @@ +class A { + trait T[A] + def usetHk[T[_], A](ta: T[A]) = 0 + usetHk(new T[Int]{}: T[Int]) + usetHk(new T[Int]{}) // fails with: found: java.lang.Object with T[Int], required: ?T[ ?A ] +}
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