Fix #4451 and 4481: default in export statements
#4483
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…nt only when it follows `export` or `as`
This was referenced Apr 9, 2017
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The lexer was treating every appearance of
defaultwithin anexportstatement as thedefaultkeyword, leading to #4451. This PR treatsdefaultas a keyword in an export statement only when it followsexportoras, or is already covered by the grammar as part of anExportSpecifier, which fixes #4451.We had the ability to import a module member named
default, but notexportone. This adds that ability, fixing #4481. Tests for these cases are included.