This is pdfTeX, Version 3.141592653-2.6-1.40.22 (TeX Live 2021/Arch Linux) (preloaded format=pdflatex 2021.5.25) 30 NOV 2021 22:50 entering extended mode \write18 enabled. file:line:error style messages enabled. %&-line parsing enabled. **test-hbox.tex (./test-hbox.tex LaTeX2e <2020-10-01> patch level 4 L3 programming layer <2021-02-18> (/usr/share/texmf-dist/tex/latex/base/minimal.cls Document Class: minimal 2001/05/25 Standard LaTeX minimal class ) (/usr/share/texmf-dist/tex/latex/l3backend/l3backend-pdftex.def File: l3backend-pdftex.def 2021-03-18 L3 backend support: PDF output (pdfTeX) \l__color_backend_stack_int=\count179 \l__pdf_internal_box=\box47 ) (./test-hbox.aux (./test-hbox-2.aux)) \openout1 = `test-hbox.aux'. LaTeX Font Info: Checking defaults for OML/cmm/m/it on input line 2. LaTeX Font Info: ... okay on input line 2. LaTeX Font Info: Checking defaults for OMS/cmsy/m/n on input line 2. LaTeX Font Info: ... okay on input line 2. LaTeX Font Info: Checking defaults for OT1/cmr/m/n on input line 2. LaTeX Font Info: ... okay on input line 2. LaTeX Font Info: Checking defaults for T1/cmr/m/n on input line 2. LaTeX Font Info: ... okay on input line 2. LaTeX Font Info: Checking defaults for TS1/cmr/m/n on input line 2. LaTeX Font Info: ... okay on input line 2. LaTeX Font Info: Checking defaults for OMX/cmex/m/n on input line 2. LaTeX Font Info: ... okay on input line 2. LaTeX Font Info: Checking defaults for U/cmr/m/n on input line 2. LaTeX Font Info: ... okay on input line 2. ./test-hbox.tex:3: Undefined control sequence. l.3 \errorcommand {blah} The control sequence at the end of the top line of your error message was never \def'ed. If you have misspelled it (e.g., `\hobx'), type `I' and the correct spelling (e.g., `I\hbox'). Otherwise just continue, and I'll forget about whatever was undefined. (./test-hbox-1.tex ./test-hbox-1.tex:1: Undefined control sequence. l.1 \anothererrorcommand {blah} The control sequence at the end of the top line of your error message was never \def'ed. If you have misspelled it (e.g., `\hobx'), type `I' and the correct spelling (e.g., `I\hbox'). Otherwise just continue, and I'll forget about whatever was undefined. LaTeX Font Info: External font `cmex10' loaded for size (Font) <7> on input line 3. LaTeX Font Info: External font `cmex10' loaded for size (Font) <5> on input line 3. Overfull \hbox (5.97499pt too wide) detected at line 5 \OML/cmm/m/it/10 aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa [] ) [1{/var/lib/texmf/fonts/map/pdftex/updmap/pdftex.map}] \openout2 = `test-hbox-2.aux'. (./test-hbox-2.tex) Overfull \hbox (550.24501pt too wide) in paragraph at lines 3--5 [] [] [2 ] (./test-hbox-3.tex [3 ] Overfull \hbox (489.75499pt too wide) in paragraph at lines 2--2 [][] [] ) [4 ] (./test-hbox.aux (./test-hbox-2.aux)) ) Here is how much of TeX's memory you used: 212 strings out of 478994 5199 string characters out of 5864751 286943 words of memory out of 5000000 17771 multiletter control sequences out of 15000+600000 403430 words of font info for 27 fonts, out of 8000000 for 9000 1141 hyphenation exceptions out of 8191 38i,4n,46p,138b,85s stack positions out of 5000i,500n,10000p,200000b,80000s Output written on test-hbox.pdf (4 pages, 21283 bytes). PDF statistics: 25 PDF objects out of 1000 (max. 8388607) 16 compressed objects within 1 object stream 0 named destinations out of 1000 (max. 500000) 1 words of extra memory for PDF output out of 10000 (max. 10000000)