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Created attachment 10424 [details]
Example that fails.
Git commit 5ecee9a0c835bb4a5f6f2723bc4d6af9a42da70d (and 8057adf2e8498b0ca0aa63463c16e34910a2651d fixing the build), found by git bisect, that introduced System.Type from reference sources broke something, I believe, in DLR.
My error occurred in IronPython library.
I am unable to create a minimal example of the bug, because Microsoft.Scripting is terra incognita for me, but I have managed to create a minimal example with IronPython.
The attached code, referencing the newest IronPython from https://github.com/IronLanguages/main, works both on .NET and on Mono a53e9778b33f1de82ea4639ef18f6ae9852d5534.
Required libraries from IronLanguages:
On later versions of Mono the error is:
'NullImporter' object has no attribute 'find_module'
(there is such a class in IronPython, with 'find_module' method)
I will also attach a full tar.gz with sources and compiled required libraries.
Created attachment 10426 [details]
complete project with precompiled binaries
This looks like duplicate of #28184. Please could you retest with #28184 fixed?
I have tested on 2c95d347b6f1d3c0de92f35b60b266f446f33690 (the current HEAD), same wrong results.
Fixed in master