make eof inferable

Author: bicycle1885

src/stream.jl

@@ -183,7 +183,7 @@ function Base.eof(stream::TranscodingStream)
     elseif mode == :panic
         throw_panic_error()
     else
-        assert(false)
+        @assert false
     end
 end
 

test/codecnoop.jl

@@ -2,6 +2,7 @@
     source = IOBuffer("")
     stream = TranscodingStream(Noop(), source)
     @test eof(stream)
+    @inferred eof(stream)
     @test read(stream) == UInt8[]
     @test contains(repr(stream), "mode=read")