fix: throw error with correct loc

[JounQin]

No description provided.

[codesandbox-ci]

This pull request is automatically built and testable in CodeSandbox.

To see build info of the built libraries, click here or the icon next to each commit SHA.

[codecov-commenter]

Codecov Report

Merging #382 (ae9d3c6) into master (68d41a1) will increase coverage by 0.01%.
The diff coverage is 100.00%.

❗ Current head ae9d3c6 differs from pull request most recent head 4231a8e. Consider uploading reports for the commit 4231a8e to get more accurate results

@@            Coverage Diff             @@
##           master     #382      +/-   ##
==========================================
+ Coverage   99.04%   99.06%   +0.01%     
==========================================
  Files          18       18              
  Lines         210      214       +4     
  Branches       38       40       +2     
==========================================
+ Hits          208      212       +4     
  Misses          1        1              
  Partials        1        1              

Impacted Files	Coverage Δ
packages/eslint-mdx/src/parser.ts	100.00% <100.00%> (ø)

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 68d41a1...4231a8e. Read the comment docs.

[wooorm]

looks good, right?