OCCT

puts "================"
puts "OCC25407"
puts "================"
puts ""
#######################################################################
# Exception in extrema operation.
#######################################################################

restore [locate_data_file bug25407_e2.brep] e
restore [locate_data_file bug25407_f2.brep] f

mkcurve c e
mksurface s f

trim st s -0.168011130695572 0. -16.5 0.
trim ct c 1.1167213545471877e-008 0.033333343614041021

extrema ct st

if { [isdraw ext_1] } {
   set len [lindex [length ext_1] end]
   checkreal "Extrema min distance" $len 1.00005e-07 1.e-7 1.e-7
} else {
   puts "Error: invalid result"
}