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Keith Randall 8415ec8c98 cmd/compile: in compiler errors, print more digits for floats close to an int 
Error messages currently print floats with %.6g, which means that if
you tried to convert something close to, but not quite, an integer, to
an integer, the error you get looks like "cannot convert 1 to type
int", when really you want "cannot convert 0.9999999 to type int".

Add more digits to floats when printing them, to make it clear that they
aren't quite integers. This helps for errors which are the result of not
being an integer. For other errors, it won't hurt much.

Fixes #56220

Change-Id: I7f5873af5993114a61460ef399d15316925a15a5
Reviewed-on: https://go-review.googlesource.com/c/go/+/442935
Reviewed-by: Rob Pike <r@golang.org>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Robert Griesemer <gri@google.com>
Reviewed-by: Keith Randall <khr@google.com>
Run-TryBot: Keith Randall <khr@golang.org>
2022-10-20 21:52:09 +00:00
..
abi
alias3.dir
asmhdr.dir
bench
chan
closure3.dir test: relax closure name matching in closure3.go 2022-10-01 01:52:16 +00:00
closure5.dir
codegen cmd/compile: intrinsify Sub64 on loong64 2022-10-07 18:16:26 +00:00
ddd2.dir
dwarf
fixedbugs cmd/compile: in compiler errors, print more digits for floats close to an int 2022-10-20 21:52:09 +00:00
import2.dir
import4.dir go/types, types2: use "and not used" instead of "but not used" in error messages 2022-09-27 21:10:19 +00:00
interface cmd/compile: use "missing method m" instead of "missing m method" 2022-09-24 17:04:15 +00:00
intrinsic.dir runtime: replace all uses of CtzXX with TrailingZerosXX 2022-10-18 18:06:27 +00:00
ken
linkname.dir
method4.dir
retjmp.dir
runtime
stress
syntax go/parser: adjustments to error messages 2022-09-01 22:37:04 +00:00
typeparam test: enable issue47631.go for Unified IR 2022-09-30 23:00:20 +00:00
uintptrescapes.dir
64bit.go
235.go
alg.go
alias1.go
alias2.go cmd/compile: use "cannot use %s as %s value in %s: %s" error message 2022-09-28 22:28:39 +00:00
alias3.go
alias.go
align.go
append1.go cmd/compile: use "cannot use %s as %s value in %s: %s" error message 2022-09-28 22:28:39 +00:00
append.go
args.go
armimm.go
asmhdr.go
assign1.go
assign.go
atomicload.go
bigalg.go
bigmap.go
blank1.go
blank.go
bom.go
bombad.go
bounds.go
cannotassign.go
chancap.go
chanlinear.go
char_lit1.go
char_lit.go
checkbce.go
clearfat.go
closedchan.go
closure1.go
closure2.go
closure3.go
closure4.go
closure5.go
closure6.go
closure7.go
closure.go
cmp6.go
cmp.go
cmplx.go
cmplxdivide1.go
cmplxdivide.c
cmplxdivide.go
complit1.go
complit.go
compos.go
const1.go
const2.go
const3.go
const4.go
const5.go
const6.go
const7.go go/types, types2: check integer constant literal overflow 2022-08-16 01:11:29 +00:00
const8.go test: add more tests for const decls with ommitted RHS expressions 2022-06-28 18:11:31 +00:00
const.go
convert1.go
convert2.go go/types, types2: implement slice-to-array conversions 2022-09-08 15:55:44 +00:00
convert3.go
convert4.go cmd/compile: implement slice-to-array conversions 2022-09-19 18:58:26 +00:00
convert.go
convlit1.go
convlit.go
convT2X.go
copy1.go
copy.go
crlf.go
ddd1.go cmd/compile: use "cannot use %s as %s value in %s: %s" error message 2022-09-28 22:28:39 +00:00
ddd2.go
ddd.go
decl.go
declbad.go
defer.go
defererrcheck.go
deferfin.go
defernil.go
deferprint.go
deferprint.out
devirt.go
directive2.go cmd/compile: restrict //go:notinheap to runtime/internal/sys 2022-09-02 06:22:23 +00:00
directive.go cmd/compile: restrict //go:notinheap to runtime/internal/sys 2022-09-02 06:22:23 +00:00
divide.go
divmod.go
embedfunc.go
embedvers.go
empty.go
env.go
eof1.go
eof.go
escape2.go
escape2n.go
escape3.go
escape4.go test: skip inlining check in escape4.go 2022-10-01 01:52:17 +00:00
escape5.go
escape_array.go
escape_calls.go
escape_closure.go
escape_field.go
escape_goto.go
escape_hash_maphash.go
escape_iface_nounified.go [dev.unified] test: break escape_iface.go into unified/nounified variants 2022-06-30 18:41:26 +00:00
escape_iface_unified.go [dev.unified] cmd/compile/internal/noder: implicit conversions for multi-valued expressions 2022-06-30 18:42:24 +00:00
escape_iface.go [dev.unified] test: break escape_iface.go into unified/nounified variants 2022-06-30 18:41:26 +00:00
escape_indir.go
escape_level.go
escape_map.go
escape_param.go
escape_runtime_atomic.go
escape_selfassign.go
escape_slice.go cmd/compile: implement slice-to-array conversions 2022-09-19 18:58:26 +00:00
escape_struct_param1.go
escape_struct_param2.go
escape_struct_return.go
escape_sync_atomic.go
escape_unsafe.go test: fix typo in escape_unsafe.go 2022-09-07 17:25:59 +00:00
escape.go
fibo.go
finprofiled.go
float_lit2.go
float_lit3.go
float_lit.go
floatcmp.go
for.go
func1.go
func2.go
func3.go
func4.go
func5.go
func6.go
func7.go
func8.go
func.go
funcdup2.go
funcdup.go
fuse.go
gc1.go
gc2.go
gc.go
gcgort.go
gcstring.go
goprint.go
goprint.out
goto.go
heapsampling.go
helloworld.go
helloworld.out
if.go
import1.go go/types, types2: use "and not used" instead of "but not used" in error messages 2022-09-27 21:10:19 +00:00
import2.go
import4.go
import5.go
import6.go
import.go
index0.go
index1.go
index2.go
index.go
indirect1.go
indirect.go
init1.go
init.go
initcomma.go
initempty.go
initexp.go cmd/compile: use "init... cycle" instead of "init... loop" in error messages 2022-09-23 20:27:09 +00:00
initialize.go
initializerr.go
initloop.go
inline_big.go
inline_caller.go
inline_callers.go
inline_endian.go cmd/compile: make encoding/binary appends cheaper to inline 2022-09-15 21:05:02 +00:00
inline_literal.go
inline_math_bits_rotate.go
inline_nounified.go [dev.unified] test: extract different inline test between unified and non-unified 2022-06-15 21:22:56 +00:00
inline_sync.go sync: convert RWMutex.{readerCount,readerWait} to atomic type 2022-09-09 18:28:35 +00:00
inline_unified.go cmd/compile/internal/noder: fix inlined function literal positions 2022-08-25 18:46:22 +00:00
inline_variadic.go
inline.go [dev.unified] test: extract different inline test between unified and non-unified 2022-06-15 21:22:56 +00:00
int_lit.go
intcvt.go
intrinsic_atomic.go
intrinsic.go
iota.go
label1.go
label.go
linkmain_run.go test: update test/run.go and some tests to use importcfg 2022-10-12 23:16:41 +00:00
linkmain.go
linkname3.go
linkname.go
linkobj.go test: update test/run.go and some tests to use importcfg 2022-10-12 23:16:41 +00:00
linkx_run.go
linkx.go
literal2.go
literal.go
live1.go
live2.go
live_regabi.go cmd/compile: stop using VARKILL 2022-08-18 17:36:38 +00:00
live_uintptrkeepalive.go
live.go cmd/compile: stop using VARKILL 2022-08-18 17:36:38 +00:00
loopbce.go cmd/compile: tighten bounds for induction variables in strided loops 2022-08-31 22:04:55 +00:00
mainsig.go
makechan.go
makemap.go
makenew.go
makeslice.go
mallocfin.go
map1.go
map.go
mapclear.go
maplinear.go
maymorestack.go
mergemul.go
method1.go cmd/compile: use "method T.m already declared" for method redeclaration errors 2022-09-27 21:59:19 +00:00
method2.go
method3.go
method4.go
method5.go
method6.go
method7.go
method.go
named1.go
named.go
nil.go
nilcheck.go [dev.unified] test: tweak nilcheck test 2022-06-30 18:41:59 +00:00
nilptr2.go
nilptr3.go
nilptr4.go
nilptr5_aix.go
nilptr5_wasm.go
nilptr5.go cmd/compile: handle partially overlapping assignments 2022-08-23 19:56:32 +00:00
nilptr_aix.go
nilptr.go
nosplit.go
nowritebarrier.go
nul1.go
opt_branchlikely.go
parentype.go
peano.go
phiopt.go
print.go
print.out
printbig.go
printbig.out
prove_constant_folding.go
prove.go cmd/compile: teach prove about bitwise OR operation 2022-08-31 09:35:45 +00:00
range.go
README.md
recover1.go
recover2.go
recover3.go
recover4.go
recover5.go
recover.go
reflectmethod1.go
reflectmethod2.go
reflectmethod3.go
reflectmethod4.go
reflectmethod5.go
reflectmethod6.go
reflectmethod7.go
reflectmethod8.go
rename1.go
rename.go
reorder2.go
reorder.go
retjmp.go
return.go
rotate0.go
rotate1.go
rotate2.go
rotate3.go
rotate.go
run.go test: update test/run.go and some tests to use importcfg 2022-10-12 23:16:41 +00:00
rune.go
runtime.go
shift1.go
shift2.go
shift3.go
sieve.go
sigchld.go
sigchld.out
simassign.go
sinit_run.go
sinit.go
sizeof.go
slice3.go
slice3err.go
slicecap.go
sliceopt.go
solitaire.go
stack.go
stackobj2.go
stackobj3.go
stackobj.go
strcopy.go
strength.go
string_lit.go
stringrange.go
struct0.go
switch2.go go/parser: adjustments to error messages 2022-09-01 22:37:04 +00:00
switch3.go
switch4.go
switch5.go
switch6.go cmd/compile: use "missing method m" instead of "missing m method" 2022-09-24 17:04:15 +00:00
switch7.go
switch.go [dev.unified] test: add switch test case for tricky nil handling 2022-07-19 23:30:49 +00:00
tinyfin.go
torture.go
turing.go
typecheck.go
typecheckloop.go cmd/compile: use "init... cycle" instead of "init... loop" in error messages 2022-09-23 20:27:09 +00:00
typeswitch1.go
typeswitch2.go
typeswitch2b.go go/types, types2: use "and not used" instead of "but not used" in error messages 2022-09-27 21:10:19 +00:00
typeswitch3.go
typeswitch.go
uintptrescapes2.go
uintptrescapes3.go
uintptrescapes.go
uintptrkeepalive.go
undef.go
unsafe_slice_data.go cmd/compile: add support for unsafe.{String,StringData,SliceData} 2022-08-31 17:15:15 +00:00
unsafe_string_data.go cmd/compile: add support for unsafe.{String,StringData,SliceData} 2022-08-31 17:15:15 +00:00
unsafe_string.go cmd/compile: add support for unsafe.{String,StringData,SliceData} 2022-08-31 17:15:15 +00:00
unsafebuiltins.go cmd/compile: add support for unsafe.{String,StringData,SliceData} 2022-08-31 17:15:15 +00:00
used.go
utf.go
varerr.go
varinit.go
winbatch.go
writebarrier.go
zerodivide.go

README.md

The test directory contains tests of the Go tool chain and runtime. It includes black box tests, regression tests, and error output tests. They are run as part of all.bash.

To run just these tests, execute:

../bin/go run run.go

To run just tests from specified files in this directory, execute:

../bin/go run run.go -- file1.go file2.go ...

Standard library tests should be written as regular Go tests in the appropriate package.

The tool chain and runtime also have regular Go tests in their packages. The main reasons to add a new test to this directory are:

  • it is most naturally expressed using the test runner; or
  • it is also applicable to gccgo and other Go tool chains.