Smart knit fials when a custom function is defined in multiple lines

[jooyoungseo]

Type: Bug

Smart knit fails when custom function is defined in multiple lines below. This example is retrieved from https://bookdown.org/yihui/rmarkdown-cookbook/custom-knit.html

---
knit: |
  (function(input, ...) {
    rmarkdown::render(
      input,
      output_file = paste0(
        xfun::sans_ext(input), '-', Sys.Date(), '.html'
      ),
      envir = globalenv()
    )
  })
---

There is no issue when the function is defined in a single line right after knit: field.

Extension version: 2.8.1
VS Code version: Code - Insiders 1.82.0-insider (501baeb5e07b5a404f862d922bacb93771d91331, 2023-08-18T05:32:38.035Z)
OS version: Windows_NT x64 10.0.22621
Modes:

System Info

Item	Value
CPUs	11th Gen Intel(R) Core(TM) i5-1145G7 @ 2.60GHz (8 x 2611)
GPU Status	2d_canvas: enabled canvas_oop_rasterization: enabled_on direct_rendering_display_compositor: disabled_off_ok gpu_compositing: enabled multiple_raster_threads: enabled_on opengl: enabled_on rasterization: enabled raw_draw: disabled_off_ok video_decode: enabled video_encode: enabled vulkan: disabled_off webgl: enabled webgl2: enabled webgpu: enabled
Load (avg)	undefined
Memory (System)	15.71GB (6.36GB free)
Process Argv	. --crash-reporter-id b05b88e5-8894-4031-ae34-fa034ebddea9
Screen Reader	yes
VM	0%

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