equal_assign changed to expr_or_assign_or_help in R 4.0

[renkun-ken]

The = token changed from equal_assign to expr_or_assign_or_help in R 4.0, breaking the xpaths we use in scope completion, definition, and hover.

R 3.6

> e <- parse(text = "a=1")

> getParseData(e)
  line1 col1 line2 col2 id parent        token terminal text
8     1    1     1    3  8      0 equal_assign    FALSE     
1     1    1     1    1  1      3       SYMBOL     TRUE    a
3     1    1     1    1  3      8         expr    FALSE     
2     1    2     1    2  2      8    EQ_ASSIGN     TRUE    =
4     1    3     1    3  4      5    NUM_CONST     TRUE    1
5     1    3     1    3  5      8         expr    FALSE     

R 4.0

> e <- parse(text= "a=1")

> getParseData(e)
  line1 col1 line2 col2 id parent                  token terminal text
9     1    1     1    3  9      0 expr_or_assign_or_help    FALSE     
1     1    1     1    1  1      3                 SYMBOL     TRUE    a
3     1    1     1    1  3      9                   expr    FALSE     
2     1    2     1    2  2      9              EQ_ASSIGN     TRUE    =
5     1    3     1    3  5      6              NUM_CONST     TRUE    1
6     1    3     1    3  6      9                   expr    FALSE