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Gleam's Erlang backend now emits abstract forms instead of source

gleam.run 14 min read Editor score 8/10

Gleam 1.19 generates Erlang abstract forms, allowing it to skip the tokenizer and parser; the change also improves build times and source-location metadata. Compiler pipeline changes like this can yield practical gains without changing the target runtime.

What: Gleam v1.19 replaces generated Erlang source code with Erlang abstract forms, a metadata-annotated tree representing Erlang syntax.
How: The binary-encoded forms let Gleam load generated code directly, skipping the front half of the Erlang compiler; the rewrite improves build times and source-location metadata.
Why it matters: Faster compilation and accurate original-source locations improve the development and debugging experience for Gleam projects running on Erlang.

Gleam's code generator emits abstract forms used by the Erlang compiler. Sketched from the article's own text.

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