Recently I was reading the article “The array features in Fortran 8X with examples of their use” by Reid & Wilson (1985). I was bemused to find a number of features that are not part of Fortran today, and some which found their way under different names.
Here is a list of some of the features that appear were discussed at some point but ultimately dropped or covered by other language enhancements:

Array constructors

[10[1.3,2.7],7.1]
returns an array of length 21 and contains[1.3,2.7]
repeated ten times 
[1:N]
contains integers 1, 2, …,N


Array construction functions

DIAGONAL(VECTOR [,FILL])
Create a diagonal matrix 
REPLICATE(ARRAY, DIM, NCOPIES)
Replicates array by increasing a dimension


Identify statement
IDENTIFY <I=1:N> DIAG(I) = A(I,I)
permits the construction of subarrays that do not lie along the axes 
Array geometric location functions

FIRSTLOC(MASK [,DIM])
andLASTLOC(MASK [,DIM]
which were instead merged intoFINDLOC(ARRAY, VALUE, DIM [, MASK] [,KIND] [,BACK])

PROJECT(ARRAY, MASK, BACKGROUND [, DIM])
Select masked values

I would be interested to learn the ultimate reasons to drop these array features? Particularly the array constructors seem like they would be quite useful.