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, 10 insertions, 0 deletions

diff --git a/test/files/neg/t8325-b.check b/test/files/neg/t8325-b.check
new file mode 100644
index 0000000000..ec80826dc0
--- /dev/null
+++ b/test/files/neg/t8325-b.check
@@ -0,0 +1,10 @@
+t8325-b.scala:3: error: Unmatched closing brace '}' ignored here
+  def k(is: Int*} = ???
+                ^
+t8325-b.scala:3: error: ';' expected but '=' found.
+  def k(is: Int*} = ???
+                  ^
+t8325-b.scala:4: error: eof expected but '}' found.
+}
+^
+three errors found