$ go run string-formatting.go
struct1: {1 2}
struct2: {x:1 y:2}
struct3: main.point{x:1, y:2}
type: main.point
bool: true
int1: 123
bin: 1110
int2: !
hex: 1c8
float1: 78.900000
float2: 1.234000e+08
float3: 1.234000E+08
str1: "string"
str2: "\"string\""
str3: 6865782074686973
pointer: 0xc420014090
int3: |    12|   345|
float4: |  1.20|  3.45|
float5: |1.20  |3.45  |
str4: |   foo|     b|
str5: |foo   |b     |
str6: a string
io: an error