fgm/waiig15: My version of the Writing an Interpreter in Go 1.5 code. @ ch1-lexing

Frederic G. MARAND 16c838ac4e §1.4 final: two-character operator tokens.		5 年之前
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lexer.go	16c838ac4e §1.4 final: two-character operator tokens.	5 年之前
lexer_test.go	16c838ac4e §1.4 final: two-character operator tokens.	5 年之前