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Cannot declare symbols starting with a number using the ':' character #16678

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amitmurthy opened this issue May 31, 2016 · 4 comments · Fixed by #32436
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Cannot declare symbols starting with a number using the ':' character #16678

amitmurthy opened this issue May 31, 2016 · 4 comments · Fixed by #32436
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docs This change adds or pertains to documentation

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@amitmurthy
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julia> :9A
ERROR: UndefVarError: A not defined
 in eval(::Module, ::Any) at ./boot.jl:225
 in macro expansion at ./REPL.jl:92 [inlined]
 in (::Base.REPL.##1#2{Base.REPL.REPLBackend})() at ./event.jl:46

julia> :aA
:aA
@toivoh
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toivoh commented May 31, 2016

This is to be expected, the : is for quoting Julia code, and not only for symbol literals. So only valid Julia identifiers can be retrieved as symbols this way. If you want to create other symbols, you have to use Symbol.

@amitmurthy
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OK. Should be documented though.

@ivarne ivarne added the docs This change adds or pertains to documentation label May 31, 2016
@ivarne
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ivarne commented May 31, 2016

See also #9945.

@amitmurthy
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Maybe Stefan's answer from here - http://stackoverflow.com/questions/23480722/what-is-a-symbol-in-julia - can be edited and added to the manual.

JeffBezanson added a commit that referenced this issue Jun 27, 2019
@JeffBezanson
fix #16678, add a note about when : symbol quoting syntax works
6e3e5cf
@JeffBezanson JeffBezanson mentioned this issue Jun 27, 2019
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JeffBezanson added a commit that referenced this issue Jun 27, 2019
@JeffBezanson
fix #16678, add a note about when : symbol quoting syntax works (#3…
d2e7d05 
…2436)
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fix #16678, add a note about when : symbol quoting syntax works JuliaLang/julia
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@amitmurthy @ivarne @toivoh