Issue 12378 - Compiler accepts any syntactically-valid code inside double-nested map predicate

[9rnsr]

https://d.puremagic.com/issues/show_bug.cgi?id=12378

[WalterBright]

Auto-merge toggled on

[CyberShadow]

This pull request may have introduced a regression:
https://issues.dlang.org/show_bug.cgi?id=14739

[CyberShadow]

This pull request introduced a regression:
https://issues.dlang.org/show_bug.cgi?id=15092

[CyberShadow]

This pull request introduced a regression:
https://issues.dlang.org/show_bug.cgi?id=17492

[ibuclaw]

I would say this pull request introduced a regression, but it may have already be reported.

dmd/test/fail_compilation/fail2789.d

Lines 96 to 109 in 7adc561

	fail_compilation/fail2789.d(103): Error: function `fail2789.mul14147(const(int[]) left, const(int[]) right)` conflicts with previous declaration at fail_compilation/fail2789.d(99)
	---
	*/
	struct S14147(alias func)
	{
	}
	pure auto mul14147(const int[] left, const int[] right)
	{
	S14147!(a => a) s;
	}
	pure auto mul14147(const int[] left, const int[] right)
	{
	S14147!(a => a) s;
	}