File: tconceptconstraint.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 (20 lines) | stat: -rw-r--r-- 259 bytes parent folder | download | duplicates (3)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
discard """
  errormsg: "cannot instantiate B"
  nimout: '''
got: <typedesc[string]>
but expected: <T: A>
'''
"""

type
  A = concept c
    advance(c)

  B[T: A] = object
    child: ref B[T]

proc advance(x: int): int = x + 1

var a: B[int]
var b: B[string]