Function containsError

src/compute-engine/latex-syntax/parse.ts:3198–3204

Return true if `expr` is, or contains anywhere, an `Error` node.

(expr: MathJsonExpression | null | undefined)

        // silently corrupting the value. Surface an error instead; the
        // intended nesting is written explicitly as `x^{2^3}`.
        if (nonEmptySuperscripts.length > 1)
          return this.error('unexpected-superscript', index);
        if (nonEmptySuperscripts.length !== 0) {
          const superscriptExpression: MathJsonExpression =
            nonEmptySuperscripts[0];
          const arg: MathJsonExpression = [
            'Superscript',
            result!,
            superscriptExpression,
          ];