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nil -- a symbol a parser may return to indicate acceptance of the empty string of tokens

Description

i1 : (optP constParser "abc" : charAnalyzer) ""

o1 = nil

o1 : Symbol

i2 : (optP constParser "abc" : charAnalyzer) "abc"

o2 = abc

See also

nullParser -- a terminal parser that returns the value nil

For the programmer

The object nil is a symbol.

The source of this document is in /build/reproducible-path/macaulay2-1.26.06+ds/M2/Macaulay2/packages/Parsing.m2:300:0.