[REG2.055/2.063] Issue 9279 - Static array return value implicitly converted to immutable dynamic array

[9rnsr]

https://issues.dlang.org/show_bug.cgi?id=9279

Implement more escape analysis.

[yebblies]

I'm a little concerned about adding yet another error function. How much uglier would it be without it?

[9rnsr]

I know someone said that we should not do both refactoring and regression fix in a PR.

[9rnsr]

OK, I merged to error functions into one, by taking RootObject *o.

[WalterBright]

Auto-merge toggled on

[WalterBright]

once the magicport issue is solved...

[9rnsr]

@WalterBright Sorry, fixed ddmd issue.

[CyberShadow]

I think this PR broke building the docs:

../phobos/std/path.d(2362): Error: pure function 'std.path.absolutePath' cannot call impure function 'std.path.isAbsolute!string.isAbsolute'
../phobos/std/path.d(2362): Error: safe function 'std.path.absolutePath' cannot call system function 'std.path.isAbsolute!string.isAbsolute'
../phobos/std/path.d(2364): Error: pure function 'std.path.absolutePath' cannot call impure function 'std.path.isAbsolute!string.isAbsolute'
../phobos/std/path.d(2364): Error: safe function 'std.path.absolutePath' cannot call system function 'std.path.isAbsolute!string.isAbsolute'
../phobos/std/path.d(1545): Error: pure function 'std.path.buildNormalizedPath!char.buildNormalizedPath' cannot call impure function 'std.path.isAbsolute!(const(char)[]).isAbsolute'
../phobos/std/path.d(1545): Error: 'std.path.isAbsolute!(const(char)[]).isAbsolute' is not nothrow
../phobos/std/path.d(1512): Error: function 'std.path.buildNormalizedPath!char.buildNormalizedPath' is nothrow yet may throw
../phobos/std/datetime.d(28084): Error: template instance std.path.buildNormalizedPath!char error instantiating
make: *** [docs-prerelease.json] Error 1

[9rnsr]

@CyberShadow The problem is introduced by the Phobos change: dlang/phobos#3381

[CyberShadow]

Thanks. (Strange, it was merged at 04:52 but my 05:00 build succeeded)