Position#show prints the point.

Can't ensure range position points are meaningful when we never
see them. To limit noise, only print the point when it != start.

  [x:y]    // point=x, start=x, end=y
  [p/x:y]  // point=p, start=x, end=y

I'm open to a different syntax.

Also prints NoPosition as [X] rather than [NoPosition] because
noise is for construction workers and attenders of rock concerts.

Some range position and parser tests are included so we can see
the checkfile change when the forthcoming fix happens (either an
error message improvement or a positional one.)

1 files changed, 9 insertions, 3 deletions

diff --git a/test/files/neg/t7473.check b/test/files/neg/t7473.check
index bc8c29d463..488baef94e 100644
--- a/test/files/neg/t7473.check
+++ b/test/files/neg/t7473.check
@@ -1,7 +1,13 @@
-t7473.scala:6: error: '<-' expected but '=' found.
+t7473.scala:5: error: '<-' expected but '=' found.
+  for (x = Option(i); if x == j) yield 42  //t7473.scala:4: error: '<-' expected but '=' found.
+         ^
+t7473.scala:5: error: illegal start of simple expression
+  for (x = Option(i); if x == j) yield 42  //t7473.scala:4: error: '<-' expected but '=' found.
+                    ^
+t7473.scala:8: error: '<-' expected but '=' found.
   (for (x = Option(i); if x == j) yield 42) toList
           ^
-t7473.scala:6: error: illegal start of simple expression
+t7473.scala:8: error: illegal start of simple expression
   (for (x = Option(i); if x == j) yield 42) toList
                      ^
-two errors found
+four errors found