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disallow begin inside indexing #25614

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Merged
merged 1 commit into from
Jan 18, 2018
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disallow begin inside indexing #25614

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3 changes: 3 additions & 0 deletions NEWS.md
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Original file line number Diff line number Diff line change
Expand Up @@ -184,6 +184,9 @@ Language changes
* `=>` now has its own precedence level, giving it strictly higher precedence than
`=` and `,` ([#25391]).

* `begin` is disallowed inside indexing expressions, in order to enable the syntax
`a[begin]` (for selecting the first element) in the future ([#23354]).

* Underscores for `_italics_` and `__bold__` are now supported by the Base Markdown
parser. ([#25564])

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2 changes: 2 additions & 0 deletions src/julia-parser.scm
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Expand Up @@ -1318,6 +1318,8 @@

;; parse expressions or blocks introduced by syntactic reserved words
(define (parse-resword s word)
(if (and (eq? word 'begin) end-symbol)
(parser-depwarn s "\"begin\" inside indexing expression" ""))
(with-bindings
((expect-end-current-line (input-port-line (ts:port s))))
(with-normal-context
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