well any kind of posts shall be "constructive" or at least not bashing.
I hope simply describing in a objective manner what I experienced will not be seen as bashing.
I was examining how specifying I2C-pins for RaspBerry Pi pico with the mbed-core is working.
So I installed a second portable version of the Arduino 1.8.19-IDE.
Me personal I still prefer using the old IDE.
After installing the mbed core I was looking for I2C-demo-codes in the examples.
I did not find anything.
So I looked up manually where to find the i2Cscanner-sketch
Made a copy into the subfolder .../portable/sketchbook
and tried to compile
compilation aborted with error-message
c:\arduino-temp\my-experimental-portable-arduino-ide\arduino-1.8.19\portable\packages\arduino\tools\arm-none-eabi-gcc\7-2017q4\arm-none-eabi\include\c++\7.2.1\system_error:39:10: fatal error: bits/error_constants.h: No such file or directory
system_error:39:10: fatal error: bits/error_constants.h: No such file or directory
After experiencing this compiler-error, I installed the RP2040 Earl Phillhower-core
Compiling the I2C-scanner-sketch was successful.
My personal decision: I will use the Earl PhillHower-core for RaspBerry Pi pico RP2040