I'm still really missing the AST-based navigation from Merlin / Vim, nearly every day.

[ELLIOTTCABLE]

These were one of Merlin's best features, for working in OCaml code every day:

:MerlinGrowEnclosing                                    *:MerlinGrowEnclosing*

When |:MerlinTypeOf| has been called, select the smallest expression
containing the previously highlighted expression.

Bound to <LocalLeader>n by default in normal mode.

:MerlinShrinkEnclosing                                *:MerlinShrinkEnclosing*

When |:MerlinGrowEnclosing| has been called, revert to the previously selected
expression. (i.e. the largest expression, centered around the position where
|:MerlinTypeOf| was called, which is contained in the currently highlighted
expression).

Bound to <LocalLeader>p by default in normal mode.

I see that there's ocamllsp/wrappingAstNode in the upstream repo; could that perhaps be exposed in the UI as a pair of hotkeys?

[rgrinberg]

Sure, it could be exposed. You'll need to manage the selection inside the vscode extension though.

[ulugbekna]

There's also a built-in command "Expand Selection", which uses the AST based on LPS method textDocument/selectionRange