This release improves reflect support, extends and improves the scheduler, and has a whole list of improvements to microcontroller boards. In particular, it adds supports for the ItsyBitsy M4, the NUCLEO-F103RB, and even adds some preliminary support for the GameBoy Advance.

• command line
  • fix parsing of beta Go versions
  • check the major/minor installed version of Go before compiling
  • validate -target flag better to not panic on an invalid target
• compiler
  • implement full slice expression: s[:2:4]
  • fix a crash when storing a linked list in an interface
  • fix comparing struct types by making type IDs more unique
  • fix some bugs in IR generation
  • add support for linked lists in reflect data
  • implement []rune to string conversion
  • implement support for go on func values
• standard library
  • reflect: add support for named types
  • reflect: add support for t.Bits()
  • reflect: add basic support for t.AssignableTo()
  • reflect: implement t.Align()
  • reflect: add support for struct types
  • reflect: fix bug in v.IsNil and v.Pointer for addressable values
  • reflect: implement support for array types
  • reflect: implement t.Comparable()
  • runtime: implement stack-based scheduler
  • runtime: fix bug in the sleep queue of the scheduler
  • runtime: implement memcpy for Cortex-M
  • testing: implement stub testing.B struct
  • testing: add common test logging methods such as Errorf/Fatalf/Printf
• targets
  • 386: add support for linux/386 syscalls
  • atsamd21: make SPI pins configurable so that multiple SPI ports can be
    used
  • atsamd21: correct issue with invalid first reading coming from ADC
  • atsamd21: add support for reset-to-bootloader using 1200baud over USB-CDC
  • atsamd21: make pin selection more flexible for peripherals
  • atsamd21: fix minimum delay in time.Sleep
  • atsamd51: fix minimum delay in time.Sleep
  • nrf: improve SPI write-only speed, by making use of double buffering
  • stm32f103: fix SPI frequency selection
  • stm32f103: add machine.Pin.Get method for reading GPIO values
  • stm32f103: allow board specific UART usage
  • nucleo-f103rb: add support for NUCLEO-F103RB board
  • itsybitsy-m4: add support for this board with a SAMD51 family chip
  • cortex-m: add support for arm.SystemReset()
  • gameboy-advance: add initial support for the GameBoy Advance
  • wasm: add //go:wasm-module magic comment to set the wasm module name
  • wasm: add syscall/js.valueSetIndex support
  • wasm: add syscall/js.valueInvoke support