JuliaLang/julia

`:(($+)(1,2))` prints as `:((+)(1,2))` which is `:(1 + 2)`

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#19,260 opened on Nov 8, 2016

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 (8 comments) (0 reactions) (0 assignees)Julia (48,709 stars) (5,773 forks)batch import
display and printinghelp wanted

Description

julia> :(($+)(1,2))
:((+)(1,2))

julia> :((+)(1,2))
:(1 + 2)

The printing for expressions should take into account whether something is an actual function spliced into the AST or just a symbol and print the former with a $.

Contributor guide

Tech stack
None
Domain
frontenddeveloper experience
Issue type
bug
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
4
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
1-2 days
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
stale
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
clear
Prerequisites
Julia programming basicsunderstanding of ASTfamiliarity with Julia's interpolation syntax
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
35
Research direction
Look into the printing methods for Expr objects in Julia's base library, likely in base/show.jl. Investigate how the system differentiates between a symbol and a spliced function expression. The fix should modify the printer to output a $ when the function head is a spliced expression rather than just a symbol. Related comments in the issue may provide additional context.