Unexplained assert on line 180 in vibe.core.stream #208
Description
This is version 1.8.1 of vibe-core.
I got a stray assert in otherwise working code. Very difficult to tell what the problem is, since it appears as a final function in the OutputStream interface. Running again the problem does not reoccur. It seems to be an assert possibly triggered by an environmental issue. It also might really be an error in vibe.d. I'm not sure exactly what the stream is that is not fulfilling this contract requirement, as things seem nested and hidden behind derivatives.
Here is the line of code: https://github.com/vibe-d/vibe-core/blob/v1.8.1/source/vibe/core/stream.d#L180
Not sure if this is helpful, but this is the stack trace.
core.exception.AssertError@/home/steves/.dub/packages/vibe-core-1.8.1/vibe-core/source/vibe/core/stream.d(180): Assertion failure
----------------
??:? _d_assertp [0x55b9a9560261]
/home/steves/.dub/packages/vibe-core-1.8.1/vibe-core/source/vibe/core/stream.d:180 @safe void vibe.core.stream.OutputStream.write(const(ubyte[])) [0x55b9a94c49ad]
/home/steves/.dub/packages/vibe-core-1.8.1/vibe-core/source/vibe/internal/interfaceproxy.d-mixin-302:302 @safe void vibe.internal.interfaceproxy.InterfaceProxy!(vibe.core.stream.OutputStream).InterfaceProxy.ProxyImpl!(vibe.internal.freelistref.FreeListRef!(vibe.stream.counting.CountingOutputStream, true).FreeListRef).ProxyImpl.__mixin8.__mixin2.write(void[], const(ubyte[])) [0x55b9a93e579c]
/home/steves/.dub/packages/vibe-core-1.8.1/vibe-core/source/vibe/internal/interfaceproxy.d-mixin-191:191 @safe void vibe.internal.interfaceproxy.InterfaceProxy!(vibe.core.stream.OutputStream).InterfaceProxy.__mixin22.__mixin2.write(const(ubyte[])) [0x55b9a933ae41]
../../git/vibe.d/stream/vibe/stream/wrapper.d:338 @safe void vibe.stream.wrapper.StreamOutputRange!(vibe.internal.interfaceproxy.InterfaceProxy!(vibe.core.stream.OutputStream).InterfaceProxy, 256uL).StreamOutputRange.put(const(ubyte)[]) [0x55b9a916534d]
../../git/vibe.d/http/vibe/http/common.d:610 @safe void vibe.http.common.ChunkedOutputStream.writeChunk(const(ubyte[])) [0x55b9a938c79a]
../../git/vibe.d/http/vibe/http/common.d:579 @safe void vibe.http.common.ChunkedOutputStream.flush() [0x55b9a938c4f7]
../../git/vibe.d/http/vibe/http/common.d:567 @safe ulong vibe.http.common.ChunkedOutputStream.write(const(ubyte[]), eventcore.driver.IOMode) [0x55b9a938c368]
/home/steves/.dub/packages/vibe-core-1.8.1/vibe-core/source/vibe/core/stream.d:180 @safe void vibe.core.stream.OutputStream.write(const(ubyte[])) [0x55b9a94c4992]
/home/steves/.dub/packages/vibe-core-1.8.1/vibe-core/source/vibe/internal/interfaceproxy.d-mixin-302:302 @safe void vibe.internal.interfaceproxy.InterfaceProxy!(vibe.core.stream.OutputStream).InterfaceProxy.ProxyImpl!(vibe.internal.freelistref.FreeListRef!(vibe.http.common.ChunkedOutputStream, true).FreeListRef).ProxyImpl.__mixin8.__mixin2.write(void[], const(ubyte[])) [0x55b9a93b6150]
/home/steves/.dub/packages/vibe-core-1.8.1/vibe-core/source/vibe/internal/interfaceproxy.d-mixin-191:191 @safe void vibe.internal.interfaceproxy.InterfaceProxy!(vibe.core.stream.OutputStream).InterfaceProxy.__mixin22.__mixin2.write(const(ubyte[])) [0x55b9a933ae41]
../../git/vibe.d/stream/vibe/stream/wrapper.d:318 @safe void vibe.stream.wrapper.StreamOutputRange!(vibe.internal.interfaceproxy.InterfaceProxy!(vibe.core.stream.OutputStream).InterfaceProxy, 1024uL).StreamOutputRange.flush() [0x55b9a8ff55e1]
../../git/vibe.d/stream/vibe/stream/wrapper.d:347 @safe void vibe.stream.wrapper.StreamOutputRange!(vibe.internal.interfaceproxy.InterfaceProxy!(vibe.core.stream.OutputStream).InterfaceProxy, 1024uL).StreamOutputRange.put(const(ubyte)[]) [0x55b9a8ff5827]
../../git/vibe.d/stream/vibe/stream/wrapper.d:352 @safe void vibe.stream.wrapper.StreamOutputRange!(vibe.internal.interfaceproxy.InterfaceProxy!(vibe.core.stream.OutputStream).InterfaceProxy, 1024uL).StreamOutputRange.put(const(char)[]) [0x55b9a8ff5887]
/home/steves/.dvm/compilers/dmd-2.091.1/linux/bin/../../src/phobos/std/range/primitives.d:277 @safe void std.range.primitives.doPut!(vibe.stream.wrapper.StreamOutputRange!(vibe.internal.interfaceproxy.InterfaceProxy!(vibe.core.stream.OutputStream).InterfaceProxy, 1024uL).StreamOutputRange, immutable(char)[]).doPut(ref vibe.stream.wrapper.StreamOutputRange!(vibe.internal.interfaceproxy.InterfaceProxy!(vibe.core.stream.OutputStream).InterfaceProxy, 1024uL).StreamOutputRange, ref immutable(char)[]) [0x55b9a90727a2]
/home/steves/.dvm/compilers/dmd-2.091.1/linux/bin/../../src/phobos/std/range/primitives.d:380 @safe void std.range.primitives.put!(vibe.stream.wrapper.StreamOutputRange!(vibe.internal.interfaceproxy.InterfaceProxy!(vibe.core.stream.OutputStream).InterfaceProxy, 1024uL).StreamOutputRange, immutable(char)[]).put(ref vibe.stream.wrapper.StreamOutputRange!(vibe.internal.interfaceproxy.InterfaceProxy!(vibe.core.stream.OutputStream).InterfaceProxy, 1024uL).StreamOutputRange, immutable(char)[]) [0x55b9a9072774]