Docstrings with backslashes yield "invalid escape sequence" upon precompilation #29200
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Description
Non-contaminating reproducer: start julia with
$ DEPOT_PATH=/tmp/pkgs juliaand then
(v1.0) pkg> generate Backslash
Generating project Backslash:
Backslash/Project.toml
Backslash/src/Backslash.jl
julia> edit("Backslash/src/Backslash.jl")Then add a docstring to greet:
"""
This is a docstring with a backslash: x = A \ b
"""
greet() = print("Hello World!")(I inserted the spaces between backticks to prevent confusing the markdown renderer here, but you should take them out when you try this.)
And then finally:
julia> using Backslash
[ Info: Precompiling Backslash [f5b45752-b8ef-11e8-19fb-2fec647fc92b]
ERROR: LoadError: syntax: invalid escape sequence
Stacktrace:
[1] include at ./boot.jl:317 [inlined]
[2] include_relative(::Module, ::String) at ./loading.jl:1041
[3] include(::Module, ::String) at ./sysimg.jl:29
[4] top-level scope at none:2
[5] eval at ./boot.jl:319 [inlined]
[6] eval(::Expr) at ./client.jl:389
[7] top-level scope at ./none:3
in expression starting at /tmp/Backslash/src/Backslash.jl:5
ERROR: Failed to precompile Backslash [f5b45752-b8ef-11e8-19fb-2fec647fc92b] to /tmp/pkgs/compiled/v1.0/Backslash/JC5Xv.ji.
Stacktrace:
[1] error(::String) at ./error.jl:33
[2] macro expansion at ./logging.jl:313 [inlined]
[3] compilecache(::Base.PkgId, ::String) at ./loading.jl:1187
[4] _require(::Base.PkgId) at ./logging.jl:311
[5] require(::Base.PkgId) at ./loading.jl:855
[6] macro expansion at ./logging.jl:311 [inlined]
[7] require(::Module, ::Symbol) at ./loading.jl:837Now, perhaps this is deliberate (you can fix it by changing \ to \\), but it seems a little strange to have precompilation fail due to the formatting of the docstring.
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