Update up to 2021-02-02

Updates have been a little sparse here as most of the Lumen team is occupied elsewhere. This is a brief update on some of the changes since last time. Everyone has been a bit busy after the holidays and in the start of the year. While you wait for things to pick up and move again we recommend taking a listen to the podcast Elixir Wizards that recently featured Brian Cardarella where they touch on some of the Lumen stuff towards the end.

Implement binary comprehensions in libeir_syntax_erl

The EIR Erlang frontend has supported list comprehensions for some time, but binary comprehensions have remained unimplemented due to rare usage.

Implementing this turned out to be more challenging than anticipated, due to patterns in binary comprehensions working in a fundamentally different way than any other patterns in the language. Binary comprehensions need to allow for “structural matches” on binaries, a pattern that matches on the length, but not on guards or constants.

Fix source span errors in eir

A bug around source span handling in EIR affected large parts of the standard library. (https://github.com/lumen/lumen/issues/597)

This is fixed by falling back to a slightly less sophisticated handling of source spans when macros are used. This isn’t expected to affect error messages negatively in any significant way.

Commits

Repo: lumen/lumen

• 8e109a9 by Luke Imhoff, 2021-01-08 22:54:18 -0600: Fix typo in mnesia_kernel_sup imports

• 9e862a3 by Luke Imhoff, 2021-01-08 22:51:40 -0600: mix lumen.otp.log.parse

Repo: eirproject/eir

• 51d3ba8 by Hans Elias B. Josephsen, 2021-01-27 12:19:50 +0100: Implement binary comprehensions

• e669f88 by Hans Elias B. Josephsen, 2021-01-12 13:37:12 +0100: Dump of work

• f0af441 by Hans Elias B. Josephsen, 2021-01-04 10:42:12 +0100: Update to latest nightly

• 39375b6 by Hans Elias B. Josephsen, 2021-01-05 10:34:02 +0100: Hopefully fix all source span errors.

• 7843e65 by Luke Imhoff, 2021-01-30 19:28:32 -0600: Use Allocator and Global from std::alloc