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error on large integer types as array index range (#23229)

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fixes #17163, refs #23204

Types that aren't `tyRange` and are bigger than 16 bits, so `int32`,
`uint64`, `int` etc, are disallowed as array index range types.
`tyRange` is excluded because the max array size is backend independent
(except for the specific size of `high(uint64)` which crashes the
compiler) and so there should still be an escape hatch for people who
want bigger arrays.

(cherry picked from commit 3ab8b6b2cf)
This commit is contained in:
metagn
2024-01-18 23:14:27 +03:00
committed by narimiran
parent 2c964268f8
commit f97c0cced0
2 changed files with 24 additions and 3 deletions
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18
tests/array/tlargeindex.nim Normal file
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@@ -0,0 +1,18 @@
discard """
cmd: "nim check --hints:off $file"
"""
# issue #17163
var e: array[int32, byte] #[tt.Error
^ index type 'int32' for array is too large]#
var f: array[uint32, byte] #[tt.Error
^ index type 'uint32' for array is too large]#
var g: array[int64, byte] #[tt.Error
^ index type 'int64' for array is too large]#
var h: array[uint64, byte] #[tt.Error
^ index type 'uint64' for array is too large]#
# crash in issue #23204
proc y[N](): array[N, int] = default(array[N, int]) #[tt.Error
^ index type 'int' for array is too large]#
discard y[int]()