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REPL accepts invalid input that starts with a valid complete expression #12

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opened 2026-06-16 11:23:32 +02:00 by st · 0 comments
st commented 2026-06-16 11:23:32 +02:00
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> 12 fld 3
12 : i64
> :ast 12 fld 3
(Integer 12)

The first input is accepted and appears to evaluate to something nonsensical, because 12 followed by something that is not in the follow set of 12 in expression is a valid complete expression.

REPL should probably reject input that parses correctly without parsing the complete input, or at least provide a warning.

``` > 12 fld 3 12 : i64 > :ast 12 fld 3 (Integer 12) ``` The first input is accepted and appears to evaluate to something nonsensical, because `12` followed by something that is not in the follow set of `12` in expression is a valid complete expression. REPL should probably reject input that parses correctly without parsing the complete input, or at least provide a warning.
st closed this issue 2026-06-21 21:30:22 +02:00
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st/amelie#12
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