disallow return in finally

Description

julia> function f(x)
           try
               error("test")
           finally
               return x
           end
       end

julia> f(4)
4

Contributor guide

Tech stack

None

Domain

backend

Issue type

feature

DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.

3

Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.

half day

Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.

active

ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.

clear

Prerequisites

Julia basicsParser modification experience

Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.

35

Research direction

Review the Julia compiler's parser code (likely in 'src/julia parser.scm' or similar) to understand how try finally blocks are handled. Identify the location where return statements in finally blocks are currently accepted and add a syntax error. Ensure that the change does not break other valid uses of return. Add corresponding test cases to the test suite. Consult the discussion in the issue for any concerns about backwards compatibility.