Dijkstra was not impressed by Ada:
"At one of his visits, Andrei asked my opinion about Ada. I told him
that Ada was such a mess that I shuddered at the thought that Western
security would depend on it and that I would feel much safer if the Red
Army were to adopt it as well. "
https://www.cs.utexas.edu/users/EWD/transcriptions/EWD10xx/EWD1057.html
In turn, the architects of Ada were not much impressed by Dijkstra, or
Hoare or Wirth:
"The resulting document, entitled STRAWMAN [HOLWG, 1975a], was forwarded
to the Military Departments, other government agencies, the academic
community, and industry. Additionally, a number of technical experts
outside the United States were solicited for comments. The European
community was especially responsive, particularly valuable since
language research had been more active there than in the United States
over the previous decade. ONR London paid several academics (Dijkstra,
Hoare, Wirth, ...) to provide inputs, but we got more valuable aid from
European industry."
http://archive.adaic.com/pol-hist/history/holwg-93/holwg-93.htm
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