Tests: Mentions of "non-standard guarantee" should be removed #6077
Description
Several tests mention a "non-standard guarantee":
STL/tests/std/tests/P0896R4_views_drop_while/test.cpp
Lines 428 to 429 in a690f84
STL/tests/std/tests/P0896R4_views_filter/test.cpp
Lines 430 to 431 in a690f84
STL/tests/std/tests/P0896R4_views_take_while/test.cpp
Lines 526 to 527 in a690f84
STL/tests/std/tests/P0896R4_views_transform/test.cpp
Lines 920 to 921 in a690f84
These tests were written before P2281R1, which standardizes this guarantee (see #1983).
We should stop calling it "non-standard guarantee" now.
This could be a "good first issue".