Joseph Ferano
a4c6b996ff
The trio the author decided on 2026-09-20 is now all built: def is CL's defparameter — its initialiser runs on every daemon re-run, unguarded, so an edited initialiser repaints the same storage on C-c C-c plus re-run — defonce (Clojure's name for CL's defvar, per the author) initialises once behind the .init~once. flag, and defconst stays the image. One parse arm reads both forms; the difference is Ast.reinit, carried to Tast.global's grerun. Emit.startup_plan gives a def no guard flag, and Check.check_global lifts every def initialiser — zero and literal included — into global/<n>, so the host's startup reaches it through the function cell and a re-evaluated def swaps it (Session's def_inits; Emit.redefinition declares the cell for a non-sibling target). The old defvar spelling is refused with the rename and both compiling spellings, and every program, test, doc and editor list is swept — except sand.flan, the author's live WIP, whose seven defvar lines are flagged in FIX.org and keep its three dependent tests red on this branch.
45 lines
1.5 KiB
Plaintext
45 lines
1.5 KiB
Plaintext
;;;; A program that stops, for driving the break loop from an editor.
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;;;;
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;;;; It errors on its first frame, with nothing having handled the condition,
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;;;; so [flan dev] meets a program that is already stopped — which is the state
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;;;; an editor has to cope with, and the one that is hardest to arrange on
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;;;; purpose later. Two restarts are on offer and they return different values,
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;;;; so the transcript says which one was chosen.
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;;;;
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;;;; After resuming it keeps polling, because the claim worth testing is that
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;;;; everything else still works on either side of a break.
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(import agent "vendor:agent")
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(defstruct Missing [id i32])
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(defn fetch [n i32] i32
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(restart-case
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(do (error (Missing {.id n})) 0)
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(use-placeholder [] -1)
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(retry [] 7)))
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(defonce ticks i64)
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(defn step [] i64
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(set ticks (+ ticks 1))
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ticks)
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;;; A division under a restart-case, called from the editor rather than from
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;;; main. It is here for the *other* condition the runtime builds by hand:
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;;; ArithError's three fields are a C struct in flan_rt.c and a defstruct in
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;;; the prelude, and the break loop's render now reads them field by field,
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;;; padding and all. A layout that drifted would show the op in `lhs'.
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;;; The operands are parameters so nothing constant-folds the division away.
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(defn divide [a i64 b i64] i64
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(restart-case
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(/ a b)
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(use-zero [] 0)))
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(defn main [] i32
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(agent/start "/tmp/flan-dev-break-fallback.sock")
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(print (fetch 1)) (println "")
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(dotimes [i 4000]
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(agent/wait 5)
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(set ticks (step)))
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0)
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