distinguish {x y} and {x y;} in parser, as with [ ]
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`{x y}` => (braceshcat x y)
`{x y;}` => (bracescat (row x y))
JeffBezanson
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This is syntax that's parsed but unused. Reading the tea leaves on JuliaLang/LinearAlgebra.jl#450 it seems we'll want to keep the distinction between
[x y]and[x y;], so the same should be available for{ }(to the extent we can parse it).Parses
{x y}as(braceshcat x y), to match[x y]andhcat. Parses{x y;}as(bracescat (row x y))to match[x y;]andvcat.Alternatively, we could make concatenation with
{ }a parse error until there's an actual use for it.