Errors when function name ends with 'if'

[Ben]

Hi,

It seems that there are limitations on function names that are not mentioned in the documentation. In particular, a function cannot end with "if", eg
```
salaire_relatif():
  - return salaire/avg(salaire)
test():
  - test_var: salaire_relatif()
```
leads to
```
ERROR: name 'salaire_relatwhere' is not defined
while parsing: salaire_relatif()
```
I encountered the error both on the current master branch and with the bundle.

Best,
Benjamin

[Gaëtan de Menten]

Please open an issue on github.

Gaëtan

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