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handle empty input for reval_p #523

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handle empty input for reval_p #523

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4 changes: 2 additions & 2 deletions src/eval.jl
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Original file line number Diff line number Diff line change
Expand Up @@ -111,7 +111,7 @@ Evaluate an R expression array iteratively. If `throw_error` is `false`,
the error message and warning will be thrown to stderr.
"""
function reval_p(expr::Ptr{ExprSxp}, env::Ptr{EnvSxp})
local val
val = nothing
protect(expr)
protect(env)
try
Expand All @@ -122,7 +122,7 @@ function reval_p(expr::Ptr{ExprSxp}, env::Ptr{EnvSxp})
unprotect(2)
end
# set .Last.value
if env == Const.GlobalEnv.p
if val !== nothing && env == Const.GlobalEnv.p
set_last_value(val)
end
val
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