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Diffstat (limited to 'tests/untried/neg/t6771b.scala')
| -rw-r--r-- | tests/untried/neg/t6771b.scala | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/tests/untried/neg/t6771b.scala b/tests/untried/neg/t6771b.scala new file mode 100644 index 000000000..78f11f775 --- /dev/null +++ b/tests/untried/neg/t6771b.scala @@ -0,0 +1,16 @@ +// Currently, the pattern matcher widens the type of the +// scrutinee, so this doesn't typecheck. This test just +// confirms this behaviour, although it would be an improvement +// to change this and make this a `pos` test. +// +// But, to the intrepid hacker who works on this, a few notes: +// You'll have to look into places in the pattern matcher that +// call `dealias`, and see if they need to be `dealiasWiden`. +// For example, if `checkableType` used only `dealias`, `pos/t6671.scala` +// would fail. +object Test { + val a = ""; var b: a.type = a + + b = b match { case x => x } +} + |