Message formatting when using `@nowarn("verbose")`

[lrytz]

class C:
  @annotation.nowarn("v") def f = try 1

shows

-- [E002] Syntax Warning: /Users/luc/code/scala/scala13/sandbox/A.scala:2:34 ---
2 |  @annotation.nowarn("v") def f = try 1
  |                                  ^^^^^
  |                   A try without catch or finally is equivalent to putting
  |                   its body in a block; no exceptions are handled.
Matching filters for @nowarn or -Wconf:
  - id=E2
  - name=EmptyCatchAndFinallyBlock
  |
  | longer explanation available when compiling with `-explain`

The | margin is missing.