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Document reservation of double underscore names (dunders) #51215

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Document reservation of double underscore names (dunders) #51215

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Documentation reservation of double underscore names (dunders)
mkitti Sep 6, 2023
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Update doc/src/base/base.md
mkitti Sep 6, 2023
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3 changes: 3 additions & 0 deletions doc/src/base/base.md
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Expand Up @@ -52,6 +52,9 @@ This is the list of reserved keywords in Julia:
`return`, `struct`, `true`, `try`, `using`, `while`.
Those keywords are not allowed to be used as variable names.

Names starting and ending with double underscores, or dunders, are reserved for use by Julia. Examples of dunder names in use include [`__init__`](@ref), [`__source__`]@(ref), [`__module__`](@ref), [`__precompile__`](@ref), [`@__dot__`](@ref), [`@__DIR__`](@ref), [`@__FILE__`](@ref), [`@__LINE__`](@ref), and [`@__MODULE__`](@ref). These reservations are not currently enforced by the parser.
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The following two-word sequences are reserved:
`abstract type`, `mutable struct`, `primitive type`.
However, you can create variables with names:
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