RUN: split-file %s %t
RUN: llvm-symbolizer --filter-markup < %t/input 2> %t.error
RUN: FileCheck %s --input-file=%t.error --match-full-lines

CHECK: error: tags must be all lowercase characters
CHECK: error: tags must be all lowercase characters

;--- input
{{{t2g}}}
{{{tAg}}}