File: tmonoid.nim

package info (click to toggle)
nim 2.2.0-1
  • links: PTS, VCS
  • area: main
  • in suites: sid
  • size: 1,911,644 kB
  • sloc: sh: 24,603; ansic: 1,761; python: 1,492; makefile: 1,013; sql: 298; asm: 141; xml: 13
file content (25 lines) | stat: -rw-r--r-- 434 bytes parent folder | download | duplicates (5)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
discard """
  output: '''true'''
"""

# bug #3686

type Monoid = concept x, y
  x + y is type(x)
  type(z(type(x))) is type(x)

proc z(x: typedesc[int]): int = 0

echo(int is Monoid)

# https://github.com/nim-lang/Nim/issues/8126
type AdditiveMonoid* = concept x, y, type T
  x + y is T

  # some redundant checks to test an alternative approaches:
  type TT = type(x)
  x + y is type(x)
  x + y is TT

doAssert(1 is AdditiveMonoid)