`error-concat-string-error-handling`

Subject: op:&
Category: error-code
Formula: =#VALUE!&"x"
Canonical: #VALUE!

Per-engine results

matches canonical diverges no fixture

Engine	Verdict	Value
gsheets	match	#VALUE!
excel	match	#VALUE!
lattice	match	#VALUE!
ironcalc	match	#VALUE!
hyperformula	match	#VALUE!
libreoffice	diverge	—
formulas	match	#VALUE!
pycel	diverge	#NAME?