uint8_t is marked as unknown type name and Serial.xxx is marked as undeclared id

Development Tools IDE 2.x
1

I have just installed Arduino IDE 2.0.0-beta.3 and get some errors:

  1. uint8_t is marked (red underline) as unknown type name.
  2. Serial.begin(9600) is marked (red underline) as undeclared identifier.

When I make a verify it do not find an error, so it seems at it is only in the workspace it is marked.
When I upload it to the Board, it works as with IDE 1.8.13

But the problem is that the IDE "checking feature" does not work as expected as non-error is marked as error.

2

Thanks for your report @finnholm.

Which board do you have selected from the Arduino IDE's Tools > Board menu?

3

It is Mega 2560.

4

I'm using beta 7 and the problem is still there. This time with an Arduino Nano. All "Serial" are "undeclared" and there is an undefined uint8_t in <Servo.h>.

5

IncorrectErrors
IncorrectErrors811×517 45.4 KB

This error is still there in nightly.20210428. But I have a little more information. It is only happening to me for STM32 boards. It does not happen for ESP32 boards.

6

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