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discard """
output: '''
Hello World
Hello World'''
"""
type MyProc = proc() {.cdecl.}
type MyProc2 = proc() {.nimcall.}
type MyProc3 = proc() #{.closure.} is implicit
proc testProc() = echo "Hello World"
proc callPointer(p: pointer) =
# can cast to proc(){.cdecl.}
let ffunc0 = cast[MyProc](p)
# can cast to proc(){.nimcall.}
let ffunc1 = cast[MyProc2](p)
# cannot cast to proc(){.closure.}
doAssert(not compiles(cast[MyProc3](p)))
ffunc0()
ffunc1()
callPointer(cast[pointer](testProc))
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