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The REPL renderer is most of println

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plan.org puts a compiler-provided, type-directed println at milestone 5: a
structural printer selected or emitted per concrete instantiation, Ptr printed
as an address rather than followed, depth and length bounded. That is a
description of the renderer C-x C-e already has - same walk, same refusals, the
same three bounds - pointed at flan_dev_emit and the wire instead of at stdout.

Recorded next to the renderer so it is not built a second time. What println
needs on top is a stdout sink, a builtin that takes its printer from the
argument's type, and the any/Error cases, which have no compile-time type to
walk.
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Joseph Ferano 2026-09-11 12:25:59 +07:00
parent f55ec0a0b8
commit 55d7c2fae8
1 changed files with 11 additions and 0 deletions
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@ -791,6 +791,17 @@ socket. The read is safe without a handshake because `flan_dev_result` bumps a
generation counter last; the daemon waits for it to move rather than assuming generation counter last; the daemon waits for it to move rather than assuming
the program has reached a frame boundary. the program has reached a frame boundary.
**This renderer is most of `println`**, which is worth knowing before anyone
schedules it. plan.org describes a compiler-provided, type-directed intrinsic
that selects or emits a structural printer per concrete instantiation, prints
structs, fixed arrays and options structurally, prints a `Ptr` as its address
rather than following it, and bounds depth and length. That is a description of
what `Session` already does for `C-x C-e` — same walk, same refusals, same
three bounds — aimed at `flan_dev_emit` and the wire instead of at stdout. What
`println` needs on top is a stdout sink, a builtin that takes its printer from
the argument's type, and the `any`/`Error` dynamic cases, which have no
compile-time type to walk. Not the walk itself.
The renderer is a **compile-time walk over the type**, emitting a piece at a The renderer is a **compile-time walk over the type**, emitting a piece at a
time through `flan_dev_emit`. Piecewise because a struct is its fields with time through `flan_dev_emit`. Piecewise because a struct is its fields with
punctuation between them, and concatenating that in generated IR would need an punctuation between them, and concatenating that in generated IR would need an