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refactor(config): drop merge_layers .. so new fields can't be silently unmerged

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merge_layers destructured OmnigraphConfig with a `..` rest-pattern, so a config
field added later would be silently dropped from the cross-layer fold (a drift trap).
Bind every field explicitly (intentionally-ignored ones as `_`) so a new field fails
to compile here until it is dispositioned — the compiler is the guard.
This commit is contained in:
Ragnor Comerford 2026-06-05 12:36:28 +02:00
parent 1a6371d015
commit 938248dfcf
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1 changed files with 9 additions and 4 deletions
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13
crates/omnigraph-config/src/merge.rs
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@ -37,6 +37,12 @@ pub fn merge_layers(layers: Vec<LoadedLayer>) -> (OmnigraphConfig, Provenance) {
let mut loaded_from_file = false;
for LoadedLayer { layer, config } in layers {
// No `..` rest-pattern: every field is bound explicitly so a config field
// added later FAILS TO COMPILE here until it is dispositioned (merged or
// deliberately ignored). The compiler is the drift-guard. The `_`-bound
// fields are intentionally not merged: `project` has no consumer; `server`
// is folded into `serve` at load (empty here); `legacy_keys` drives the
// per-layer warnings the caller emits before merge.
let OmnigraphConfig {
version: layer_version,
defaults,
@ -50,10 +56,9 @@ pub fn merge_layers(layers: Vec<LoadedLayer>) -> (OmnigraphConfig, Provenance) {
queries,
base_dir: layer_base_dir,
loaded_from_file: layer_loaded,
// Ignored: `project` (no consumer) and `server` (folded into `serve`
// at load) are empty here; `legacy_keys` drives per-layer warnings the
// caller emits before merge.
..
project: _,
server: _,
legacy_keys: _,
} = config;
if layer_version.is_some() {