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## Summary This PR reworks `TypeInferenceBuilder::infer_type_expression()` so that we emit diagnostics when encountering a list literal in a type expression. The only place where a list literal is allowed in a type expression is if it appears as the first argument to `Callable[]`, and `Callable` is already heavily special-cased in our type-expression parsing. In order to ensure that list literals are _always_ allowed as the _first_ argument to `Callabler` (but never allowed as the second, third, etc. argument), I had to do some refactoring of our type-expression parsing for `Callable` annotations. ## Test Plan New mdtests added, and existing ones updated
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.