Always show the seed on simulation

CHANGELOG.md

@@ -28,6 +28,9 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 ### Deprecated
 ### Removed
 ### Fixed
+
+- The seed was not being properly printed when the simulator found some runtime errors (#1524).
+
 ### Security
 
 ## v0.22.1 -- 2024-09-25

quint/io-cli-tests.md

@@ -101,7 +101,7 @@ in the lookup table for the expression with ID 7:
 
 <!-- !test in type and effect maps are output -->
 ```
-quint typecheck --out typecheck-out-example.json ../examples/language-features/tuples.qnt > /dev/null
+quint typecheck --out typecheck-out-example.json ../examples/language-features/tuples.qnt
 printf "first type: " && cat typecheck-out-example.json | jq '.types."7".type.kind'
 printf "first effect: " && cat typecheck-out-example.json | jq '.effects."8".effect.kind'
 rm typecheck-out-example.json
@@ -443,8 +443,8 @@ An example execution:
 [State 4] { n: 12 }
 
 [violation] Found an issue (duration).
-Use --seed=0x308623f2a48e7 to reproduce.
 Use --verbosity=3 to show executions.
+Use --seed=0x308623f2a48e7 to reproduce.
 error: Invariant violated
 ```
 
@@ -477,8 +477,8 @@ An example execution:
 [State 4] { action_taken: "OnDivByThree", n: 12, nondet_picks: {  } }
 
 [violation] Found an issue (duration).
-Use --seed=0x308623f2a48e7 to reproduce.
 Use --verbosity=3 to show executions.
+Use --seed=0x308623f2a48e7 to reproduce.
 error: Invariant violated
 ```
 
@@ -508,9 +508,9 @@ An example execution:
 [State 4] { n: 12 }
 
 [ok] No violation found (duration).
-Use --seed=0x11 to reproduce.
 You may increase --max-samples and --max-steps.
 Use --verbosity to produce more (or less) output.
+Use --seed=0x11 to reproduce.
 ```
 
 ### Repl evaluates coin
@@ -589,8 +589,8 @@ An example execution:
 }
 
 [violation] Found an issue (duration).
-Use --seed=0x1e352e160ffbb3 to reproduce.
 Use --verbosity=3 to show executions.
+Use --seed=0x1e352e160ffbb3 to reproduce.
 error: Invariant violated
 ```
 
@@ -721,8 +721,8 @@ q::stepAndInvariant => false
 }
 
 [violation] Found an issue (duration).
-Use --seed=0x1786e678d460fe to reproduce.
 Use --verbosity=3 to show executions.
+Use --seed=0x1786e678d460fe to reproduce.
 error: Invariant violated
 ```
 
@@ -1164,9 +1164,11 @@ error: Tests failed
 
 ### Fail on run with uninitialized constants
 
+FIXME: this should not be a runtime error
+
 <!-- !test in run uninitialized -->
 ```
-output=$(quint run testFixture/_1041compileConst.qnt 2>&1)
+output=$(quint run testFixture/_1041compileConst.qnt --seed=1 2>&1)
 exit_code=$?
 echo "$output" | sed -e 's/([0-9]*ms)/(duration)/g' \
   -e 's#^.*_1041compileConst.qnt#HOME/_1041compileConst.qnt#g'
@@ -1180,6 +1182,7 @@ HOME/_1041compileConst.qnt:5:24 - error: [QNT500] Uninitialized const N. Use: im
 5:   action init = { x' = N }
                           ^
 
+Use --seed=0x1 to reproduce.
 error: Runtime error
 ```
 

quint/src/cliCommands.ts

@@ -81,6 +81,7 @@ interface OutputStage {
   // Possible results from 'run'
   status?: 'ok' | 'violation' | 'failure' | 'error'
   trace?: QuintEx[]
+  seed?: bigint
   /* Docstrings by definition name by module name */
   documentation?: Map<string, Map<string, DocumentationEntry>>
   errors?: ErrorMessage[]
@@ -104,6 +105,7 @@ const pickOutputStage = ({
   ignored,
   status,
   trace,
+  seed,
 }: ProcedureStage) => {
   return {
     stage,
@@ -119,6 +121,7 @@ const pickOutputStage = ({
     ignored,
     status,
     trace,
+    seed,
   }
 }
 
@@ -567,6 +570,10 @@ export async function runSimulator(prev: TypecheckedStage): Promise<CLIProcedure
     ? { status: (evalResult.value as QuintBool).value ? 'ok' : 'violation' }
     : { status: 'error', errors: [evalResult.value] }
 
+  const states = recorder.bestTraces[0]?.frame?.args?.map(e => e.toQuintEx(zerog))
+  const frames = recorder.bestTraces[0]?.frame?.subframes
+  simulator.seed = recorder.bestTraces[0]?.seed
+
   recorder.bestTraces.forEach((trace, index) => {
     const maybeEvalResult = trace.frame.result
     if (maybeEvalResult.isLeft()) {
@@ -584,9 +591,6 @@ export async function runSimulator(prev: TypecheckedStage): Promise<CLIProcedure
     options.onTrace(index, status, evaluator.varNames(), states)
   })
 
-  const states = recorder.bestTraces[0]?.frame?.args?.map(e => e.toQuintEx(zerog))
-  const frames = recorder.bestTraces[0]?.frame?.subframes
-  const seed = recorder.bestTraces[0]?.seed
   switch (outcome.status) {
     case 'error':
       return cliErr('Runtime error', {
@@ -600,7 +604,6 @@ export async function runSimulator(prev: TypecheckedStage): Promise<CLIProcedure
       maybePrintCounterExample(verbosityLevel, states, frames)
       if (verbosity.hasResults(verbosityLevel)) {
         console.log(chalk.green('[ok]') + ' No violation found ' + chalk.gray(`(${elapsedMs}ms).`))
-        console.log(chalk.gray(`Use --seed=0x${seed.toString(16)} to reproduce.`))
         if (verbosity.hasHints(verbosityLevel)) {
           console.log(chalk.gray('You may increase --max-samples and --max-steps.'))
           console.log(chalk.gray('Use --verbosity to produce more (or less) output.'))
@@ -617,7 +620,6 @@ export async function runSimulator(prev: TypecheckedStage): Promise<CLIProcedure
       maybePrintCounterExample(verbosityLevel, states, frames)
       if (verbosity.hasResults(verbosityLevel)) {
         console.log(chalk.red(`[violation]`) + ' Found an issue ' + chalk.gray(`(${elapsedMs}ms).`))
-        console.log(chalk.gray(`Use --seed=0x${seed.toString(16)} to reproduce.`))
 
         if (verbosity.hasHints(verbosityLevel)) {
           console.log(chalk.gray('Use --verbosity=3 to show executions.'))
@@ -866,21 +868,28 @@ export async function docs(loaded: LoadedStage): Promise<CLIProcedure<Documentat
 export function outputResult(result: CLIProcedure<ProcedureStage>) {
   result
     .map(stage => {
+      const verbosityLevel = deriveVerbosity(stage.args)
       const outputData = pickOutputStage(stage)
       if (stage.args.out) {
         writeToJson(stage.args.out, outputData)
+      } else if (!stage.args.outItf && outputData.seed && verbosity.hasResults(verbosityLevel)) {
+        console.log(chalk.gray(`Use --seed=0x${outputData.seed.toString(16)} to reproduce.`))
       }
 
       process.exit(0)
     })
     .mapLeft(({ msg, stage }) => {
       const { args, errors, sourceCode } = stage
+      const verbosityLevel = deriveVerbosity(args)
       const outputData = pickOutputStage(stage)
       if (args.out) {
         writeToJson(args.out, outputData)
       } else {
         const finders = createFinders(sourceCode!)
         uniqWith(errors, isEqual).forEach(err => console.error(formatError(sourceCode, finders, err)))
+        if (!stage.args.outItf && outputData.seed && verbosity.hasResults(verbosityLevel)) {
+          console.log(chalk.gray(`Use --seed=0x${outputData.seed.toString(16)} to reproduce.`))
+        }
         console.error(`error: ${msg}`)
       }
       process.exit(1)