diff options
Diffstat (limited to 'grammar/item.go')
| -rw-r--r-- | grammar/item.go | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/grammar/item.go b/grammar/item.go index 153aea4..100d920 100644 --- a/grammar/item.go +++ b/grammar/item.go @@ -195,4 +195,10 @@ type lrState struct { // s → ・A // s → ・ε emptyProdItems []*lrItem + + // When isErrorTrapper is `true`, the item can shift the `error` symbol. The item has the following form. + // The `α` and `β` can be empty. + // + // A → α・error β + isErrorTrapper bool } |