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this in a part-owned action resolves to the action performance instead of the owning part

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  • ¿Algo no está bien?
#720 1 comentario 0 reacciones 0 asignados Ver en GitHub

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Evaluación

Dificultad
4/5
Tiempo estimado
3-5 días
Aptitud para principiantes
48/100
Tipo de issue
Error
Claridad
Bastante claro
Estado de actividad
Activo
Stack tecnológico
go
Área
compilers

Línea de trabajo

Start with the minimal model in bug.sysml and reproduce the issue using %load, %instantiate p, and %features p.a. Trace how this is resolved for the owned action a, using the quoted SysML rules as the expected behavior. Done means ctx resolves to owning part p and the type-mismatch error no longer occurs.

Escrito por el modelo de indexación a partir del texto del issue.

Descripción

bug
Model and observed behaviour
Minimal model (`bug.sysml`), on sysml v0.9.0 (Windows):


// Written in file: bug.sysml
action def A {
    ref part ctx : P;
}
part def P {
    action a : A {
        :>> ctx = this;
    }
}
part p : P;


Command:


sysml> %load bug.sysml
sysml> %instantiate p
sysml> %features p.a


Output:


Instance: p.a (ID: 2)
Features:
  ctx: <error: feature value a.ctx: type mismatch: cannot write instance(2) (instance) to a feature typed by P>


`instance(2)` is the performance of action `a` itself (i.e. `p.a`), not `p`. So
`a.this` resolved to the action, and `:>> ctx = this` tried to write the action into a
`P`-typed feature.
What the specification requires

a is an ownedAction of part p, so a.this must be p; :>> ctx = this should
set ctx to p, with no error.

OMG SysML v2.0 (formal/2026-03-02), Part 1, §9.2.4.2.1 (Part):

"The this reference of a ownedAction is always its owning Part."

Same document, §8.4.13.2 (Action Usages — "Semantics of this"):

"... the value of this is the top-level Action in the hierarchy ..., unless that
top-level Action is itself one of the ownedActions of a Part (or one of the
ownedPerformances of an Item), in which case the value is that Part (or Item)."

Kind of gap

Valid model is rejected (false positive)

Reference implementation

No response

Version

sysml v0.9.0 Commit: ee54ea03ea3ca8fb2c796ecda364adf748c40304 Build time: 2026-09-25_01:12:11 Go version: go1.25.0

Lenguaje dominante
Go
Estrellas
24
Forks
5
Merge medio
10 h 11 min
PR fusionados (30 d)
572

Preparar el entorno

Primeros pasos

  1. Lee el issue completo y luego la guía de contribución del proyecto.
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  3. Haz un fork del repositorio y trabaja en una rama.
  4. Abre un pull request que haga referencia al número del issue.

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