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author | Antoine Gourlay <antoine@gourlay.fr> | 2014-07-31 17:52:13 +0200 |
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committer | Antoine Gourlay <antoine@gourlay.fr> | 2014-08-12 15:47:20 +0200 |
commit | 756e551b30461b548ea59e99562634775b7ebd74 (patch) | |
tree | 678fd556b17768d1cf533135bbfd1741df025d8d /test/files/neg/t4851/J2.java | |
parent | 84d4ebc19a1e54dbe446ef35b71efa7ad3890c19 (diff) | |
download | scala-756e551b30461b548ea59e99562634775b7ebd74.tar.gz scala-756e551b30461b548ea59e99562634775b7ebd74.tar.bz2 scala-756e551b30461b548ea59e99562634775b7ebd74.zip |
SI-5691 lint warning when a type parameter shadows an existing type.
This adds a new lint warning for when a class/method/type-member's
type parameter shadows an existing type: `-Xlint:type-parameter-shadow`.
It excludes type parameters of synthetic methods (the user can't
rename or remove those anyway), otherwise, for example, every case class
triggers the warning.
Also fixes a test that contained wrong java sources (that didn't even
compile...), discovered thanks to the warning.
---
This kind of errors shows up every now and then on the mailing-list, on
stackoverflow, etc. so maybe a warning would be useful.
I was afraid this would yield too many warnings for libraries that are
heavy on type parameters, but no: running this on scalaz and shapeless
HEAD (`v7.1.0-RC1-41-g1cc0a96` and `v2.0.0-M1-225-g78426a0` respectively)
yields 44 warnings. None of them are false positives; they usually come
from:
- scalaz loving using `A` as type parameter, even several levels deep
of parametrized classes/methods
- or calling a type parameter that will hold a map `Map`, or similar,
thus shadowing an existing type
Diffstat (limited to 'test/files/neg/t4851/J2.java')
-rw-r--r-- | test/files/neg/t4851/J2.java | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/test/files/neg/t4851/J2.java b/test/files/neg/t4851/J2.java index 82954d9489..a90f48e269 100644 --- a/test/files/neg/t4851/J2.java +++ b/test/files/neg/t4851/J2.java @@ -1,11 +1,11 @@ public class J2<T> { T x; - public <T> J(T x) { + public J2(T x) { this.x = x; } public String toString() { return "J2:" + x.getClass(); } -}
\ No newline at end of file +} |