[BUG] Function parameter names that also are PQ type names are incorrectly syntax highlighted

[bgribaudo]

In M, it is valid to name function parameters after M types, as parameter names will not be interpreted as type names when defining a function’s signature. However, syntax highlighting does not seem to make this distinction.

Expected behavior In a function signature, parameters that have the same names as M types should be syntax highlighted the same as parameters with other names.

Actual behavior Parameters with the same names as M types are highlighted differently.

Notice below how the red-underlined parameter names (which are identical to M type names) receive different syntax highlighting than the green-underlined one.

To Reproduce In VSCode, create a Power Query file containing the following content:

(table as table, function as function, a as number) as any => ...