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Emit explanatory error message for iteration on CartesianIndex #24284

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Nov 3, 2017
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Emit explanatory error message for iteration on CartesianIndex #24284

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5 changes: 5 additions & 0 deletions base/multidimensional.jl
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Original file line number Diff line number Diff line change
Expand Up @@ -147,6 +147,11 @@ module IteratorsMD
return ni
end

# Iteration over the elements of CartesianIndex cannot be supported until its length can be inferred,
# see #23719
Base.start(::CartesianIndex) =
error("iteration is deliberately unsupported for CartesianIndex. Use `I` rather than `I...`, or use `Tuple(I)...`")

# Iteration
"""
CartesianRange(sz::Dims) -> R
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