nim c --verbosity:3 a

gistfile1.txt

home/gokr/nim/test/a.nim(1, 8) Error: cannot open 'c'
  import c
         ^
Traceback (most recent call last)
nim.nim(115)             nim
nim.nim(71)              handleCmdLine
main.nim(253)            mainCommand
main.nim(64)             commandCompileToC
modules.nim(227)         compileProject
modules.nim(172)         compileModule
passes.nim(203)          processModule
passes.nim(137)          processTopLevelStmt
sem.nim(461)             myProcess
sem.nim(433)             semStmtAndGenerateGenerics
semstmts.nim(1536)       semStmt
semexprs.nim(870)        semExprNoType
semexprs.nim(2407)       semExpr
importer.nim(176)        evalImport
importer.nim(163)        myImportModule
importer.nim(57)         checkModuleName
msgs.nim(982)            localError
msgs.nim(970)            liMessage
msgs.nim(847)            handleError
msgs.nim(826)            quit