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Copying from JuliaLang/julia#52842:
Minimal example:
macro var"let"(bindings, body)
bindings.head == :tuple || error("malformed let bindings $bindings")
bindings.head = :block
esc(Expr(:let, bindings, body))
endjulia> (@let (x=1, y=2) (x + y))
3
julia> (@let (x=1, y=2)
(x + y))
ERROR: ParseError:
# Error @ REPL[14]:1:17
(@let (x=1, y=2)
# └ ── whitespace is not allowed here
Stacktrace:
[1] top-level scope
@ none:1Kinda a weird case, but I was thinking about how it'd be nice to be able to use the form (@foo x y) instead of @foo(x, y) to avoid having to write commas, but currently the parser demands that there's no whitespace in the middle of a macro arguments.
Maybe a more realistic example of where one might want to do this would be
julia> (@inline
function foo(x)
x + 1
end)
ERROR: ParseError:
# Error @ REPL[16]:2:1
(@inline
function foo(x)
└────────────┘ ── Expected `)`
Stacktrace:
[1] top-level scope
@ none:1Is this something we could reasonably allow? I guess the worry is that it could alternatively be interpreted as (@foo(x); y) instead of (@foo(x, y)), but I think the parsing as (@foo(x, y)) is more consistent with how we handle infix operators, e.g.
julia> (1
+2)
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