Something like this is not very helpful in identifying a root cause:

panic: fatal: An assertion has failed
 
goroutine 201 [running]:
 
<http://github.com/pulumi/pulumi/sdk/v3/go/common/util/contract.failfast(...)|github.com/pulumi/pulumi/sdk/v3/go/common/util/contract.failfast(...)>
 
	/Users/alexlokshin/go/pkg/mod/github.com/pulumi/pulumi/sdk/v3@v3.8.0/go/common/util/contract/failfast.go:23
 
<http://github.com/pulumi/pulumi/sdk/v3/go/common/util/contract.Assert(...)|github.com/pulumi/pulumi/sdk/v3/go/common/util/contract.Assert(...)>
 
	/Users/alexlokshin/go/pkg/mod/github.com/pulumi/pulumi/sdk/v3@v3.8.0/go/common/util/contract/assert.go:26
 
<http://github.com/pulumi/pulumi/sdk/v3/go/pulumi.marshalInputAndDetermineSecret(0x288d040|github.com/pulumi/pulumi/sdk/v3/go/pulumi.marshalInputAndDetermineSecret(0x288d040>, 0xc0000e0000, 0x2d2a180, 0x25fdda0, 0xc0000dd801, 0x109e5f2, 0x265f0e0, 0x1, 0xc0000dd898, 0x109ce25, ...)
 
	/Users/alexlokshin/go/pkg/mod/github.com/pulumi/pulumi/sdk/v3@v3.8.0/go/pulumi/rpc.go:280 +0x38c5
 
<http://github.com/pulumi/pulumi/sdk/v3/go/pulumi.marshalInput(0x29b50e0|github.com/pulumi/pulumi/sdk/v3/go/pulumi.marshalInput(0x29b50e0>, 0xc000288850, 0x2d2a180, 0x25fdda0, 0x29b5001, 0xc000288850, 0x265f0e0, 0xc0000120b0, 0x94, 0x0, ...)
 
	/Users/alexlokshin/go/pkg/mod/github.com/pulumi/pulumi/sdk/v3@v3.8.0/go/pulumi/rpc.go:171 +0x73
 
<http://github.com/pulumi/pulumi/sdk/v3/go/pulumi.marshalInputAndDetermineSecret(0x26d12a0|github.com/pulumi/pulumi/sdk/v3/go/pulumi.marshalInputAndDetermineSecret(0x26d12a0>, 0xc000188450, 0x2d2a180, 0x2632e00, 0xc0001eee01, 0x1785baf, 0x273ee80, 0xc000592350, 0x2d2a180, 0x2454880, ...)
 
	/Users/alexlokshin/go/pkg/mod/github.com/pulumi/pulumi/sdk/v3@v3.8.0/go/pulumi/rpc.go:374 +0x100a
 
<http://github.com/pulumi/pulumi/sdk/v3/go/pulumi.marshalInput(0x26d12a0|github.com/pulumi/pulumi/sdk/v3/go/pulumi.marshalInput(0x26d12a0>, 0xc000188450, 0x2d2a180, 0x25fdda0, 0x1, 0x1, 0x0, 0x0, 0x0, 0x0, ...)
 
	/Users/alexlokshin/go/pkg/mod/github.com/pulumi/pulumi/sdk/v3@v3.8.0/go/pulumi/rpc.go:171 +0x73
 
<http://github.com/pulumi/pulumi/sdk/v3/go/pulumi.(*Context).RegisterResourceOutputs.func1(0xc00026e000|github.com/pulumi/pulumi/sdk/v3/go/pulumi.(*Context).RegisterResourceOutputs.func1(0xc00026e000>, 0x2d24678, 0xc00023c1c0, 0xc000188450)
 
	/Users/alexlokshin/go/pkg/mod/github.com/pulumi/pulumi/sdk/v3@v3.8.0/go/pulumi/context.go:1400 +0x13d
 
created by <http://github.com/pulumi/pulumi/sdk/v3/go/pulumi.(*Context).RegisterResourceOutputs|github.com/pulumi/pulumi/sdk/v3/go/pulumi.(*Context).RegisterResourceOutputs>
 
	/Users/alexlokshin/go/pkg/mod/github.com/pulumi/pulumi/sdk/v3@v3.8.0/go/pulumi/context.go:1387 +0x96
 
exit status 2
 
error: an unhandled error occurred: program exited with non-zero exit code: 1