inlayhint: fix server crashers when open file is removed

Author: aspeddro

CHANGELOG.md

@@ -24,6 +24,7 @@
 - Fix Incorrect semantic highlighting of `external` declarations https://github.com/rescript-lang/rescript-vscode/pull/517
 
 - Fix issue where doc comment with nested comments inside is not shown properly on hover https://github.com/rescript-lang/rescript-vscode/pull/526
+- Fix server crashes when open file is removed from disk with inlayHints enabled https://github.com/rescript-lang/rescript-vscode/issues/538
 
 ## v1.4.2
 

analysis/src/Hint.ml

@@ -82,7 +82,7 @@ let inlay ~path ~pos ~maxLength ~debug =
     Ast_iterator.default_iterator.value_binding iterator vb
   in
   let iterator = {Ast_iterator.default_iterator with value_binding} in
-  (if Filename.check_suffix path ".res" then
+  (if Files.exists path && Filename.check_suffix path ".res" then
    let parser =
      Res_driver.parsingEngine.parseImplementation ~forPrinter:false
    in
@@ -143,7 +143,7 @@ let codeLens ~path ~debug =
   let iterator = {Ast_iterator.default_iterator with value_binding} in
   (* We only print code lenses in implementation files. This is because they'd be redundant in interface files,
      where the definition itself will be the same thing as what would've been printed in the code lens. *)
-  (if Filename.check_suffix path ".res" then
+  (if Files.exists path && Filename.check_suffix path ".res" then
    let parser =
      Res_driver.parsingEngine.parseImplementation ~forPrinter:false
    in