foo.cc: In member function 'void interval::load(func)':
foo.cc:121:7: warning: suggest parentheses around assignment used as truth value [-Wparentheses]
  121 | if (t = fi(ff.value(l) - f.value(l)))
      |     ~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
foo.cc:126:12: warning: suggest parentheses around assignment used as truth value [-Wparentheses]
  126 | else if (t = fi(ff.value(r) - f.value(r)))
      |          ~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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