This is pdfTeX, Version 3.14159265-2.6-1.40.21 (TeX Live 2020/W32TeX) (preloaded format=pdflatex 2020.6.30)  6 AUG 2020 15:32
entering extended mode
 restricted \write18 enabled.
 %&-line parsing enabled.
**IfFileHasChanged02a.tex
(./IfFileHasChanged02a.tex
LaTeX2e <2020-02-02> patch level 5
L3 programming layer <2020-06-18>
(c:/texlive/2020/texmf-dist/tex/latex/l3kernel/expl3.sty
Package: expl3 2020-06-18 L3 programming layer (loader)

(c:/texlive/2020/texmf-dist/tex/latex/l3backend/l3backend-pdfmode.def
File: l3backend-pdfmode.def 2020-06-23 L3 backend support: PDF mode
\l__kernel_color_stack_int=\count167
\l__pdf_internal_box=\box45
))
\g_tmpa_iow=\write3
\openout3 = `myfile.txt'.


(c:/texlive/2020/texmf-dist/tex/latex/base/article.cls
Document Class: article 2019/12/20 v1.4l Standard LaTeX document class
(c:/texlive/2020/texmf-dist/tex/latex/base/size10.clo
File: size10.clo 2019/12/20 v1.4l Standard LaTeX file (size option)
)
\c@part=\count168
\c@section=\count169
\c@subsection=\count170
\c@subsubsection=\count171
\c@paragraph=\count172
\c@subparagraph=\count173
\c@figure=\count174
\c@table=\count175
\abovecaptionskip=\skip47
\belowcaptionskip=\skip48
\bibindent=\dimen134
)
(c:/texlive/2020/texmf-dist/tex/latex/l3packages/xparse/xparse.sty
Package: xparse 2020-05-15 L3 Experimental document command parser

(c:/texlive/2020/texmf-dist/tex/latex/l3packages/xparse/xparse-generic.tex
\l__xparse_current_arg_int=\count176
\g__xparse_grabber_int=\count177
\l__xparse_m_args_int=\count178
\l__xparse_v_nesting_int=\count179
))
(./IfFileHasChanged02a.aux)
\openout1 = `IfFileHasChanged02a.aux'.

LaTeX Font Info:    Checking defaults for OML/cmm/m/it on input line 63.
LaTeX Font Info:    ... okay on input line 63.
LaTeX Font Info:    Checking defaults for OMS/cmsy/m/n on input line 63.
LaTeX Font Info:    ... okay on input line 63.
LaTeX Font Info:    Checking defaults for OT1/cmr/m/n on input line 63.
LaTeX Font Info:    ... okay on input line 63.
LaTeX Font Info:    Checking defaults for T1/cmr/m/n on input line 63.
LaTeX Font Info:    ... okay on input line 63.
LaTeX Font Info:    Checking defaults for TS1/cmr/m/n on input line 63.
LaTeX Font Info:    ... okay on input line 63.
LaTeX Font Info:    Checking defaults for OMX/cmex/m/n on input line 63.
LaTeX Font Info:    ... okay on input line 63.
LaTeX Font Info:    Checking defaults for U/cmr/m/n on input line 63.
LaTeX Font Info:    ... okay on input line 63.

Didn't change!
(./IfFileHasChanged02a.aux) )
(\end occurred when \iftrue on line 69 was incomplete)
Here is how much of TeX's memory you used:
 790 strings out of 480471
 18673 string characters out of 5903300
 250577 words of memory out of 5000000
 16896 multiletter control sequences out of 15000+600000
 532338 words of font info for 24 fonts, out of 8000000 for 9000
 1141 hyphenation exceptions out of 8191
 29i,1n,33p,210b,36s stack positions out of 5000i,500n,10000p,200000b,80000s

No pages of output.
PDF statistics:
 0 PDF objects out of 1000 (max. 8388607)
 0 named destinations out of 1000 (max. 500000)
 1 words of extra memory for PDF output out of 10000 (max. 10000000)