SI-8325 Accept infix star type outside patterns

This is a follow-up to SI-5702 which enabled use of
`*` in infix notation in patterns.

Most of the work is in distinguishing infix from a
sequence pattern.

Also, do not take backticked star as the repeated
parameter marker in postfix position. That is,
`Int``*``` is not `Int*` -- I hope double-tick
renders as tick. There is not a special use case
except that backticks mean "I am an identifier, as
is, and not a keyword."

1 files changed, 15 insertions, 0 deletions

diff --git a/test/files/neg/t8325.check b/test/files/neg/t8325.check
new file mode 100644
index 0000000000..175a0db415
--- /dev/null
+++ b/test/files/neg/t8325.check
@@ -0,0 +1,15 @@
+t8325.scala:5: error: *-parameter must come last
+  def f(is: Int*, s: String) = ???
+        ^
+t8325.scala:7: error: *-parameter must come last
+  def h(is: Int * String *, s: String) = ???
+        ^
+t8325.scala:10: error: type mismatch;
+ found   : Int(5)
+ required: Int*
+  def j(is: Int* = 5) = ???
+                   ^
+t8325.scala:10: error: a parameter section with a `*'-parameter is not allowed to have default arguments
+  def j(is: Int* = 5) = ???
+      ^
+four errors found