add test for yesterday's interface rule change (interface/convert1.go).
move interface tests to subdirectory.

R=r
DELTA=1632  (827 added, 804 deleted, 1 changed)
OCL=29181
CL=29191
15 files changed
tree: 97c2f40f26cc4882dc5adb10c4961a6846f42cf4
  1. doc/
  2. include/
  3. lib/
  4. misc/
  5. pkg/
  6. src/
  7. test/
  8. usr/