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David Majda af701dcf80 Error handling: Implement the |expected| function
The |expected| function allows users to report regular match failures
inside actions.

If the |expected| function is called, and the reported match failure
turns out to be the cause of a parse error, the error message reported
by the parser will be in the usual "Expected ... but found ..." format
with the description specified in the |expected| call used as part of
the message.

Implements part of #198.

Speed impact
------------
Before:     1146.82 kB/s
After:      1031.25 kB/s
Difference: -10.08%

Size impact
-----------
Before:     950817 b
After:      973269 b
Difference: 2.36%

(Measured by /tools/impact with Node.js v0.6.18 on x86_64 GNU/Linux.)
11 years ago
..
generate-bytecode.js Error handling: Implement the |expected| function 11 years ago
generate-javascript.js Error handling: Implement the |expected| function 11 years ago
remove-proxy-rules.js Move options handling from passes to |PEG.compiler.compile| 12 years ago
report-left-recursion.js Make |GrammarError| require work also in the browser version 12 years ago
report-missing-rules.js Make |GrammarError| require work also in the browser version 12 years ago