original file
-----------------------------------
// @onlyOwnGrammar - since this example has slightly different scopes because of how cast expression works and isnt supported in the tsx file
const goodHighlighting = <T extends I>(
  arg: T
) => {
  const a = arg
  return a
}
-----------------------------------

Grammar: TypeScriptReact.tmLanguage
-----------------------------------
>// @onlyOwnGrammar - since this example has slightly different scopes because of how cast expression works and isnt supported in the tsx file
 ^^
 source.tsx comment.line.double-slash.tsx punctuation.definition.comment.tsx
   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
   source.tsx comment.line.double-slash.tsx
>const goodHighlighting = <T extends I>(
 ^^^^^
 source.tsx meta.var.expr.tsx storage.type.tsx
      ^
      source.tsx meta.var.expr.tsx
       ^^^^^^^^^^^^^^^^
       source.tsx meta.var.expr.tsx meta.var-single-variable.expr.tsx meta.definition.variable.tsx variable.other.constant.tsx entity.name.function.tsx
                       ^
                       source.tsx meta.var.expr.tsx meta.var-single-variable.expr.tsx
                        ^
                        source.tsx meta.var.expr.tsx keyword.operator.assignment.tsx
                         ^
                         source.tsx meta.var.expr.tsx meta.arrow.tsx
                          ^
                          source.tsx meta.var.expr.tsx meta.arrow.tsx meta.type.parameters.tsx punctuation.definition.typeparameters.begin.tsx
                           ^
                           source.tsx meta.var.expr.tsx meta.arrow.tsx meta.type.parameters.tsx entity.name.type.tsx
                            ^
                            source.tsx meta.var.expr.tsx meta.arrow.tsx meta.type.parameters.tsx
                             ^^^^^^^
                             source.tsx meta.var.expr.tsx meta.arrow.tsx meta.type.parameters.tsx storage.modifier.tsx
                                    ^
                                    source.tsx meta.var.expr.tsx meta.arrow.tsx meta.type.parameters.tsx
                                     ^
                                     source.tsx meta.var.expr.tsx meta.arrow.tsx meta.type.parameters.tsx entity.name.type.tsx
                                      ^
                                      source.tsx meta.var.expr.tsx meta.arrow.tsx meta.type.parameters.tsx punctuation.definition.typeparameters.end.tsx
                                       ^
                                       source.tsx meta.var.expr.tsx meta.arrow.tsx meta.parameters.tsx punctuation.definition.parameters.begin.tsx
>  arg: T
 ^^
 source.tsx meta.var.expr.tsx meta.arrow.tsx meta.parameters.tsx
   ^^^
   source.tsx meta.var.expr.tsx meta.arrow.tsx meta.parameters.tsx variable.parameter.tsx
      ^
      source.tsx meta.var.expr.tsx meta.arrow.tsx meta.parameters.tsx meta.type.annotation.tsx keyword.operator.type.annotation.tsx
       ^
       source.tsx meta.var.expr.tsx meta.arrow.tsx meta.parameters.tsx meta.type.annotation.tsx
        ^
        source.tsx meta.var.expr.tsx meta.arrow.tsx meta.parameters.tsx meta.type.annotation.tsx entity.name.type.tsx
>) => {
 ^
 source.tsx meta.var.expr.tsx meta.arrow.tsx meta.parameters.tsx punctuation.definition.parameters.end.tsx
  ^
  source.tsx meta.var.expr.tsx meta.arrow.tsx
   ^^
   source.tsx meta.var.expr.tsx meta.arrow.tsx storage.type.function.arrow.tsx
     ^
     source.tsx meta.var.expr.tsx meta.arrow.tsx
      ^
      source.tsx meta.var.expr.tsx meta.arrow.tsx meta.block.tsx punctuation.definition.block.tsx
>  const a = arg
 ^^
 source.tsx meta.var.expr.tsx meta.arrow.tsx meta.block.tsx
   ^^^^^
   source.tsx meta.var.expr.tsx meta.arrow.tsx meta.block.tsx meta.var.expr.tsx storage.type.tsx
        ^
        source.tsx meta.var.expr.tsx meta.arrow.tsx meta.block.tsx meta.var.expr.tsx
         ^
         source.tsx meta.var.expr.tsx meta.arrow.tsx meta.block.tsx meta.var.expr.tsx meta.var-single-variable.expr.tsx meta.definition.variable.tsx variable.other.constant.tsx
          ^
          source.tsx meta.var.expr.tsx meta.arrow.tsx meta.block.tsx meta.var.expr.tsx meta.var-single-variable.expr.tsx
           ^
           source.tsx meta.var.expr.tsx meta.arrow.tsx meta.block.tsx meta.var.expr.tsx keyword.operator.assignment.tsx
            ^
            source.tsx meta.var.expr.tsx meta.arrow.tsx meta.block.tsx meta.var.expr.tsx
             ^^^
             source.tsx meta.var.expr.tsx meta.arrow.tsx meta.block.tsx meta.var.expr.tsx variable.other.readwrite.tsx
>  return a
 ^^
 source.tsx meta.var.expr.tsx meta.arrow.tsx meta.block.tsx
   ^^^^^^
   source.tsx meta.var.expr.tsx meta.arrow.tsx meta.block.tsx keyword.control.flow.tsx
         ^
         source.tsx meta.var.expr.tsx meta.arrow.tsx meta.block.tsx
          ^
          source.tsx meta.var.expr.tsx meta.arrow.tsx meta.block.tsx variable.other.readwrite.tsx
>}
 ^
 source.tsx meta.var.expr.tsx meta.arrow.tsx meta.block.tsx punctuation.definition.block.tsx