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fixes #21360; discarding empty seqs/arrays now raises errors (#21374)

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* discarding empty seqs now raises errors

* the same goes for sets
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ringabout 2023-02-16 10:23:35 +08:00 • committed by GitHub
commit fc7385bfda
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3 changed files with 25 additions and 9 deletions
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14
tests/discard/tillegaldiscardtypes.nim Normal file
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@ -0,0 +1,14 @@
discard """
cmd: "nim check $file"
errormsg: "statement returns no value that can be discarded"
nimout: '''
tillegaldiscardtypes.nim(11, 3) Error: statement returns no value that can be discarded
tillegaldiscardtypes.nim(12, 3) Error: statement returns no value that can be discarded
'''
"""
proc b(v: int) = # bug #21360
discard @[]
discard []
b(0)

2
tests/typerel/ttypelessemptyset.nim
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@ -1,5 +1,5 @@
discard """
errormsg: "internal error: invalid kind for lastOrd(tyEmpty)"
errormsg: "statement returns no value that can be discarded"
"""
var q = false
discard (if q: {} else: {})