infra - nix configuration for my machines

	Commit message (Expand)	Author	Files	Lines
2020-01-11	lexer: test the new keywords are parsed correctly.	franck cuny	1	-3/+25
2020-01-11	token: support more keywords	franck cuny	1	-2/+13
2020-01-11	token: rewrite documentation for `LookupIdent`.	franck cuny	1	-3/+4
2020-01-11	lexer: delete redundant test.	franck cuny	1	-32/+1
2020-01-11	lexer: support more operator tokens.	franck cuny	2	-1/+31
2020-01-11	token: support more operator tokens	franck cuny	1	-3/+10
2020-01-11	lexer: initial lexer	franck cuny	2	-0/+218
2020-01-11	token: initial tokenizer.	franck cuny	1	-0/+48