## Summary Allow for literate style in Markdown tests and merge multiple (unnamed) code blocks into a single embedded file. closes #15941 ## Test Plan - Interactively made sure that error-lines were reported correctly in multi-snippet sections.
Markdown files within the mdtest/ subdirectory are tests of type inference and type checking;
executed by the tests/mdtest.rs integration test.
See crates/red_knot_test/README.md for documentation of this test format.