name: math/unbalanced-delim default: true advisory: false fix: false since: 0.1.0

math/unbalanced-delim

TeX-style math open delimiter (\[, \(, $$, $) with no matching close.

What it does

Flags display-math openers (\[) and inline-math openers ($) that have no matching closer (\] / $) before the end of the document.

\[ … \] and $ … $ are TeX-style math delimiters. mdwright treats the region between an opener and its closer as math: it suspends prose lint rules inside, and the formatter passes the bytes through verbatim. An unbalanced opener means we cannot tell where math ends; every following prose rule misreads the rest of the document, and the formatter might break the content's rendering.

The check runs before any prose rule fires, so this is the first diagnostic you should fix in a document.

Example (bad)

The Laplacian is \[ \Delta f = \sum_i \partial_i^2 f

Example (good)

The Laplacian is \[ \Delta f = \sum_i \partial_i^2 f \].

If you wanted a literal \[ in prose, escape it: \\[.

Configuration

Disable inline: .
Disable in config: [lint] ignore = ["math/unbalanced-delim"].
Severity: non-advisory (fails mdwright check --check).

References

mdwright's math-region recogniser (src/stdlib/math_unbalanced_delim.rs).
LaTeX: \[ … \] is the unnumbered display-math environment; $ … $ is the inline form.

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