note that sortmain.go has been run through hg gofmt; only the formatting of the day initializers changed. i'm happy to revert that formatting if you'd prefer. stop on error in doc/progs/run R=r CC=golang-dev https://golang.org/cl/850041
in the tests, println+panic. gofmt some tests too. R=rsc CC=golang-dev https://golang.org/cl/741041
versions of static checks in receiver1.go R=r https://golang.org/cl/155045
move interface tests to subdirectory. R=r DELTA=1632 (827 added, 804 deleted, 1 changed) OCL=29181 CL=29191